The standard way to write sets and reps is the “sets × reps” format, where the first number is how many rounds you perform and the second is how many times you lift the weight per round. “3×10 Back Squat” means three sets of ten repetitions on the back squat. But a well-written workout program includes more than just those two numbers, and the choices behind them shape your results far more than most people realize. How you pair sets with reps, what load you assign, how you note rest periods and tempo, and how you structure the whole thing over weeks all matter.
The Basic Format and What Each Number Means
Almost every written program uses one of two conventions. The first, and most common, is sets × reps: “4×8” means four sets of eight reps. The second flips the order: “8×4” meaning eight reps for four sets. Because confusion between the two is real and can lead someone to do wildly different training, most coaches and programming apps default to “sets × reps” and state that convention explicitly at the top of the program. If you are writing a program for someone else, pick one format and label it clearly.
After sets and reps, a well-written prescription typically includes the load, the rest period, and sometimes the tempo. A complete line might read: “Back Squat — 4×6 @ 80% 1RM, rest 3 min, tempo 3-1-1-0.” That single line tells the lifter what exercise to do, how many sets and reps to perform, how heavy to go, how long to rest between sets, and how fast to move the bar through each phase of the lift. Not every program spells out all five variables every session, but understanding what each one controls helps you write (or read) any program intelligently.
Choosing Reps for Your Goal
For decades, the fitness world relied on a tidy model: low reps with heavy weight build strength, moderate reps build muscle size, and high reps build endurance. That framework is not wrong as a rough guide, but it overstates how rigid the boundaries are. A 2021 review of the evidence proposed a broader view, arguing that muscular adaptations can be obtained across a wide spectrum of loading zones, not just the narrow bands the old model prescribed.1PubMed Central. Loading Recommendations for Muscle Strength, Hypertrophy, and Local Endurance: A Re-Examination of the Repetition Continuum A network meta-analysis comparing different loads found no overall differences in muscle growth between heavier and lighter training, though some nuances emerged for beginners and for people who trained more frequently.2PubMed Central. Resistance Training Load Effects on Muscle Hypertrophy and Strength Gain: Systematic Review and Network Meta-analysis
What does this mean in practice? If your primary goal is getting stronger at a specific lift, heavier loads in the range of one to six reps per set still appear to be more effective, because strength is partly a skill tied to practicing near-max efforts. If your primary goal is muscle growth, you have a wider effective window than old guidelines suggested. Sets of six, sets of twelve, even sets of twenty or more can all stimulate growth, provided you push close enough to failure. That proximity to failure turns out to be the more important variable for hypertrophy than the specific rep count itself.3PubMed Central. A Systematic Review of The Effects of Different Resistance Training Volumes on Muscle Hypertrophy
So when writing rep ranges, think of them as steering your training emphasis rather than as rigid categories. A practical approach: write “4×3–5” for a strength-focused block, “3×8–12” for a hypertrophy block, and “2×15–20” for an endurance or pump-focused block. The ranges give you room to adjust the weight session to session based on how you feel.
How Many Sets to Prescribe
Volume, meaning the total number of hard sets per muscle group per week, is one of the most debated variables in program design. The relationship between volume and results is not linear. One study compared trained individuals doing 12, 18, or 24 sets per muscle group per week. All three groups gained muscle, but the 12-set group actually showed the largest percentage increases in muscle thickness at some sites, while the 24-set group showed the smallest.4Journal of Strength & Conditioning Research. Progressive Resistance Training Volume: Effects on Muscle Thickness, Mass, and Strength Adaptations in Resistance-Trained Individuals The takeaway is not that less is always better, but that piling on more sets does not guarantee faster progress and can actually blunt it.
For most people writing their own programs, a starting point of roughly ten to twenty hard sets per muscle group per week is a sensible range. “Hard set” means a set taken within a few reps of failure, not a warm-up set at half your working weight. If you are new to training, the lower end of that range is plenty. If you have been training seriously for years and your progress has slowed, experimenting with the higher end may help, but keep an eye on recovery.
When writing the program, distribute those sets across the week. A study comparing a high-volume, low-frequency approach (doing all your sets for a muscle in one session) with a lower-volume, higher-frequency approach (spreading them across more days) found that both improved performance and lower-body muscle mass, though the concentrated approach produced better upper-body hypertrophy and body composition changes in that particular group of trained men.5PubMed. Comparison of 2 weekly-equalized volume resistance-training routines using different frequencies on body composition and performance in trained males Another study found that nine weekly sets for the biceps, performed in a single session, were enough to increase muscle thickness, while 18 to 27 sets spread across two sessions may offer greater strength gains.6International Journal of Sports Physiology and Performance. Dose-Response Relationship of Weekly Resistance-Training Volume and Frequency on Muscular Adaptations in Trained Men The upshot: how you divide your weekly sets across training days matters, and there is no single best split for everyone.
Writing Load Prescriptions
There are three common ways to tell a lifter how heavy to go, and each has trade-offs worth understanding when you write a program.
- Percentage of 1RM: “4×5 @ 80%” means use 80 percent of your one-rep max. This is precise and easy to plan in a spreadsheet, but it assumes your max is accurate and does not account for how you feel on a given day. It also requires you to test or estimate your max before the program begins.
- Repetitions in reserve (RIR): “3×8 @ 2 RIR” means stop each set when you think you could do two more reps. This autoregulates intensity based on daily readiness, but it requires honest self-assessment. Research shows that RIR-based autoregulation led to greater strength improvements over 12 weeks than fixed-percentage loading, with the autoregulated group squatting roughly 11 percent more in the front squat compared to about 8 percent for the fixed-load group.7The Journal of Strength & Conditioning Research. Autoregulation by “Repetitions in Reserve” Leads to Greater Improvements in Strength Over a 12-Week Training Program Than Fixed Loading
- RPE (rate of perceived exertion): On a 1-to-10 scale, an RPE of 8 means you could have done about two more reps, making it effectively the same as 2 RIR. RPE and RIR are often used interchangeably in modern programs, where RPE 10 equals 0 RIR (failure) and RPE 7 equals 3 RIR.
That said, RIR accuracy has limits. A study with elite rugby players found that RIR estimates were generally acceptable, but accuracy broke down on certain exercises at higher rep targets, especially the deadlift at six and nine prescribed reps and the bench press at nine reps.8Sport Sciences for Health. The efficacy of repetitions-in-reserve vs. traditional percentage-based resistance training: a 4-week pre-season randomized intervention in elite rugby league players Beginners tend to overestimate how many reps they have left, sometimes by three or four reps. The practical advice: if you are new, RIR-based prescriptions should be paired with occasional sets taken to actual failure so you can calibrate your sense of effort. As you gain experience, RIR becomes a more reliable tool.
A large meta-regression found that the relationship between the percentage of your max and the number of reps you can perform at that percentage is fairly consistent regardless of sex, age, or training status, with the notable exceptions of the bench press and leg press, where people tend to get more reps at a given percentage than the general model predicts.9PubMed Central. Maximal Number of Repetitions at Percentages of the One Repetition Maximum: A Meta-Regression and Moderator Analysis of Sex, Age, Training Status, and Exercise If you are writing percentage-based prescriptions, this means you do not need separate tables for men and women or younger and older lifters, but you may want to adjust expectations for those two specific exercises.
Writing Rest Periods
Rest between sets is one of the most commonly omitted variables in written programs, and that is a mistake because it meaningfully influences outcomes. A widely cited review concluded that resting three to five minutes between sets produced greater increases in absolute strength, while shorter rests of 30 to 60 seconds combined with moderate loads might better stimulate hypertrophy through greater hormonal responses.10PubMed. Rest interval between sets in strength training However, a later study challenged the short-rest-for-hypertrophy idea, finding that three-minute rest periods actually led to greater increases in both strength and muscle thickness compared to one-minute rest periods in resistance-trained men.11PubMed. Longer Interset Rest Periods Enhance Muscle Strength and Hypertrophy in Resistance-Trained Men
The evidence has shifted toward longer rest being generally better for both strength and size, mainly because longer rest lets you maintain higher performance across sets. If you are cutting your rest short and each set gets noticeably weaker, you are accumulating fatigue without proportionally more stimulus. That said, if your training session already takes 90 minutes and you are struggling for time, moderate rest of about two minutes is a reasonable compromise for hypertrophy work. For heavy compound lifts in a strength block, write at least three minutes.
In the written program, the simplest notation is just “rest 2–3 min” after the set/rep prescription. Some coaches write it as a separate column in a spreadsheet. Either way, include it.
Tempo Notation
Tempo prescriptions use a four-digit format, with each number representing seconds spent in a different phase of the lift. The digits follow the order: eccentric (lowering), pause at the bottom, concentric (lifting), pause at the top. So “3-1-1-0” means three seconds down, one-second pause at the bottom, one second up, no pause at the top. An “X” in the concentric slot means “as fast as possible,” which is common in power-focused programs.
A review of the research on tempo found that changing the speed of the eccentric and concentric phases influences acute exercise variables like time under tension and force output, which form the basis for different long-term adaptations.12PubMed Central. The Influence of Movement Tempo During Resistance Training on Muscular Strength and Hypertrophy Responses: A Review A recent study on squats illustrated this practically: a moderate two-second eccentric with an explosive concentric (written 2/0/X/0) produced the best improvements in both maximum squat strength and jump height, while a very slow four-second eccentric (4/0/X/0) improved max squat strength but actually decreased jumping and sprinting performance.13PLoS One. The effect of squat training with different eccentric contraction tempos on lower limb muscle strength
For most general-purpose programs, you do not need to prescribe tempo on every exercise. A controlled lowering phase (roughly two seconds) and a deliberate concentric phase is the default assumption. Tempo notation becomes useful when you want to emphasize a slow eccentric for injury rehab, enforce a pause for technique correction, or program explosive intent for athletes. If you are writing it, the four-digit system is universally understood in coaching circles.
Advanced Set Structures and How to Write Them
Beyond straight sets, several set structures appear in written programs and need their own notation.
Drop sets involve completing a set to or near failure, then immediately reducing the weight and continuing for more reps without rest. You might write: “Leg Press — 1×10+10+10 (drop set, reduce weight ~25% each drop).” A meta-analysis comparing drop sets to traditional straight sets found that both approaches significantly increased muscle size, with no meaningful difference between them.14PubMed Central. Effects of Drop Sets on Skeletal Muscle Hypertrophy: A Systematic Review and Meta-analysis Drop sets are primarily a time-saving tool: you can match the hypertrophy stimulus of multiple straight sets in fewer total sets, which matters if you are pressed for time.
Cluster sets break a set into small chunks with brief intra-set rest periods, typically 15 to 30 seconds between clusters of two to four reps. You might write: “Back Squat — 4×(2+2+2) @ 85%, 20 sec intra-set rest, 3 min inter-set rest.” Research consistently shows that cluster sets maintain velocity and power output across a training session better than traditional straight sets. One study found that clustering reps into pairs with intra-set rest maintained peak velocity throughout the workout, while traditional continuous sets saw progressive drops in power output.15International Journal of Sports Physiology and Performance. Maintenance of Velocity and Power With Cluster Sets During High-Volume Back Squats Another study confirmed that cluster loading produced higher peak power and faster time-to-peak-velocity compared to traditional loading.16The Journal of Strength & Conditioning Research. Cluster Set Loading in the Back Squat: Kinetic and Kinematic Implications These structures are most relevant for athletes training for explosive performance rather than pure hypertrophy.
Supersets pair two exercises back to back with no rest between them. In the written program: “A1. Bench Press 3×8, A2. Barbell Row 3×8, rest 2 min after A2.” The A1/A2 labeling tells the reader that these are performed as a pair. Tri-sets (A1/A2/A3) and giant sets (A1/A2/A3/A4) follow the same convention. Antagonist supersets, like pairing a push with a pull, tend to maintain performance better than same-muscle supersets.
Exercise Order and Selection
The order you list exercises in a written program implies a priority. Compound movements like squats, deadlifts, and presses are typically listed first when they are the focus, because fatigue from isolation work beforehand would compromise your performance on them. In notation, some programs mark priority explicitly with labels like “Main Lift” or “Accessory,” but listing order alone usually conveys this.
The choice between compound and isolation exercises also affects results in ways worth noting. A study comparing squat training to leg extension training found that the squat group gained more muscle thickness and produced a larger improvement in knee torque (about 14 percent versus 10 percent for leg extensions).17PubMed. Differential neuromuscular adaptations following multi-joint vs single-joint resistance exercise training This does not mean isolation work is useless. It means that when you write a program, compound movements carry more bang-per-set and deserve the earlier, fresher slots. Isolation exercises serve a targeted role later in the session.
How to Handle Proximity to Failure
Because proximity to failure is so central to whether a set actually produces a training stimulus, more coaches now write it directly into the prescription. A line like “3×10 @ 7 RPE” or “3×10, 3 RIR” tells the lifter not just how many reps to do but how hard to push each set. Research comparing training to failure versus stopping a few reps short found that going all the way to failure caused substantially more fatigue: a 25 percent drop in post-exercise lifting velocity versus 13 percent for stopping one rep short and just 8 percent for stopping three reps short.18PubMed Central. Influence of Resistance Training Proximity-to-Failure, Determined by Repetitions-in-Reserve, on Neuromuscular Fatigue in Resistance-Trained Males and Females That extra fatigue compounds across a week’s training. Most of the time, stopping one to three reps short of failure gives you nearly the same growth stimulus with much less fatigue to recover from.
When writing a program, a practical approach is to prescribe closer proximity to failure (0–1 RIR) on isolation exercises and accessory work, where failure is less risky, and keep a bigger buffer (2–3 RIR) on heavy compound lifts where form breakdown under fatigue is a real concern. Writing it into the program explicitly, rather than just telling someone to “go hard,” gives each set a clear performance target.
Velocity-Based Autoregulation
A newer approach that is filtering down from elite sport into broader programming is velocity-based training, where the lifter uses a device to measure bar speed and the program prescribes a velocity loss threshold rather than a fixed rep count. Instead of “4×6,” you might write: “Back Squat — 4 sets, stop set at 20% velocity loss from first rep.” A systematic review of elite athletes found that velocity losses in the range of 10 to 20 percent induced meaningful neuromuscular adaptations while keeping fatigue manageable.19PubMed Central. Effects of Velocity-Based Training on Strength and Power in Elite Athletes—A Systematic Review The set effectively self-selects the right number of reps based on your readiness that day. On a good day you might get eight reps before hitting the threshold; on a bad day, five.
This approach requires a velocity tracker (a linear position transducer or a phone-based app), which limits its accessibility. But if you have the equipment, it is one of the most objective ways to autoregulate, because it removes the subjectivity that makes RIR estimates unreliable for less experienced lifters.
Periodization and Changing Sets and Reps Over Time
A well-written program is not a single static page. It changes over weeks and months, and how you structure that change is called periodization. The two most common models are linear periodization, where you gradually increase intensity and decrease reps over several weeks (say, starting at 3×12 and ending at 5×3), and daily undulating periodization (DUP), where you vary the rep scheme within the same week (a heavy day of 5×3, a moderate day of 4×8, and a light day of 3×15).
Research comparing the two has generally found that DUP produces slightly larger strength gains, though the differences are not always statistically significant. One study with trained men found that DUP produced larger improvements in bench press, leg press, and arm curl compared to linear periodization, with the DUP group increasing leg press strength by about 41 percent versus 25 percent for the linear group over the training period.20PubMed. Comparison between linear and daily undulating periodized resistance training to increase strength Another study found DUP produced larger effect sizes for both max strength and submaximal strength, even though the statistical difference between groups was not significant.21The Journal of Strength & Conditioning Research. Effects of Linear vs. Daily Undulatory Periodized Resistance Training on Maximal and Submaximal Strength Gains
When writing a DUP program, the week’s notation might look like this for squats: Monday 5×3 @ 85%, Wednesday 4×8 @ 70%, Friday 3×12 @ 60%. Each session targets a different quality (strength, hypertrophy, endurance) while training the same movement pattern. This variety may help because it exposes your muscles and nervous system to different demands within a recovery-friendly structure.
Blood Flow Restriction and Clinical Populations
Not all programs are written for healthy adults chasing performance goals. People recovering from surgery, managing joint pain, or dealing with age-related muscle loss may need a different approach. Blood flow restriction training uses a cuff or wrap to partially restrict blood flow to a working muscle during low-load exercise, typically at around 20 to 30 percent of 1RM. A typical prescription might read: “Leg Extension — 4×30/15/15/15 @ 20% 1RM with BFR cuff at 60% limb occlusion pressure, rest 30 sec.” The unusual rep scheme (one long set followed by shorter sets with minimal rest) is standard in BFR protocols. Clinical research supports BFR training as a safe and effective rehabilitation tool for populations that cannot tolerate heavy loads.22PubMed Central. Blood Flow Restriction Training: Implementation into Clinical Practice Writing BFR prescriptions requires specifying the occlusion pressure and cuff width, which are variables that do not appear in standard programs but are critical for safety in this context.
Putting a Full Session on Paper
Here is what a well-written session looks like when all the variables come together. This is a hypothetical upper-body hypertrophy day for someone with a couple of years of training experience:
- A. Barbell Bench Press: 4×6–8 @ 2 RIR, rest 3 min
- B1. Dumbbell Row: 3×10 @ 2 RIR, B2. Incline DB Fly: 3×12 @ 1 RIR, rest 2 min after B2
- C. Cable Lateral Raise: 3×15 @ 1 RIR, rest 90 sec
- D. Tricep Pushdown: 2×12+12 (drop set), rest 90 sec
- E. Barbell Curl: 3×10, tempo 3-1-1-0, rest 90 sec
Each line tells the reader the exercise, the set and rep target, how hard to push, and how long to rest. The A/B/C labeling clarifies what is performed alone (A, C, D, E) and what is performed as a superset (B1/B2). The compound lifts come first with longer rest. Isolation work comes later with shorter rest and techniques like drop sets that add volume efficiently. The tempo is only specified on the curl, where a deliberate eccentric is the point of the exercise in this session. Everything else is performed at a controlled but self-selected tempo.
When writing your own programs, consistency in formatting matters as much as the content. Pick a template, whether it is a spreadsheet, a notes app, or a printed sheet, and use the same column order and abbreviation style every time. People who skip workouts rarely do it because the programming was wrong. They skip because they could not quickly read what they were supposed to do next.