Nearly every exercise raises abdominal pressure to some degree, because the core muscles and diaphragm are involved in almost all movement. The real question is how much pressure an exercise generates and whether that amount matters for your situation. The range is enormous: a gentle drawing-in of the lower belly barely moves the needle, while a heavy squat can push intra-abdominal pressure above 200 mmHg. For people recovering from abdominal surgery, managing pelvic floor dysfunction, or navigating postpartum changes, understanding where different exercises fall on that spectrum is genuinely useful.
Why Every Movement Creates Some Abdominal Pressure
Your abdomen is essentially a sealed container surrounded by muscle walls, the diaphragm on top, and the pelvic floor on the bottom. When any of these structures contract, they compress the contents inside and pressure rises. This happens when you cough, laugh, talk, or even just stand up from a chair. Measured in healthy adults lying flat, baseline abdominal pressure sits around 2 mmHg on average, but simply standing pushes it to about 20 mmHg and sitting raises it to roughly 17 mmHg.1Journal of Surgical Research. Gastrointestinal Normal Intraabdominal Pressure in Healthy Adults So before you even begin exercising, your posture has already set a baseline that varies tenfold depending on position.
The pelvic floor muscles don’t work in isolation. They contract alongside the deep abdominal muscles, particularly the transversus abdominis and internal oblique, during breathing, coughing, and limb movement.2PubMed Central. The effect of the correlation between the contraction of the pelvic floor muscles and diaphragmatic motion during breathing Researchers have confirmed that you can’t effectively contract the pelvic floor while keeping the deep abdominal wall completely relaxed, and that even a maximal pelvic floor contraction in a supine position raises abdominal pressure by about 10 mmHg.3PubMed. Pelvic floor and abdominal muscle interaction: EMG activity and intra-abdominal pressure This is important because it means the old advice to “relax your stomach completely while doing Kegels” is misguided. A small rise in pressure during pelvic floor work is normal and, in fact, necessary.
Exercises at the Low End of the Pressure Spectrum
When researchers have directly measured abdominal pressure during a range of activities, a consistent hierarchy emerges. A study that fitted women with pressure transducers during common exercises found that abdominal curl-ups produced both the lowest peak pressure and the lowest body acceleration among all activities tested, while jumping jacks produced the highest of both.4PubMed Central. The relationship between intra-abdominal pressure and body acceleration during exercise The correlation between peak body acceleration and peak abdominal pressure was strong, with an R value of about 0.74. In other words, if your body isn’t bouncing or jerking, the pressure spike tends to stay modest.
Among exercises specifically targeting the core, “drawing-in” exercises, where you gently pull your navel toward your spine without any visible trunk movement, produced the lowest pressures in a study of postpartum women. Drawing-in actually registered about 7% below the resting baseline, while a curl-up generated pressure about 43% above it.5PubMed. Intra-abdominal and perineal pressures during abdominal exercises: A cross sectional study in postpartum women Pelvic floor contractions fell in between, at roughly a third above rest. This makes drawing-in exercises one of the few activities that can strengthen deep core muscles without meaningfully increasing abdominal pressure.
Gentle engagement of the transversus abdominis, the deepest layer of abdominal muscle, also stays at the very bottom of the pressure range. Researchers measuring both muscle activity and pressure simultaneously found that a gentle transversus contraction raised pressure by only about 0.5 cmH2O, while a maximal Valsalva maneuver (bearing down hard with a closed airway) pushed it up to roughly 46 cmH2O.6PubMed. Effect of abdominal and pelvic floor tasks on muscle activity, abdominal pressure and bladder neck That’s nearly a hundredfold difference, and it illustrates how the intensity and type of muscle activation matter far more than whether an exercise is labeled “abdominal” or not.
What About Pilates and Reformer Work?
Pilates is often recommended for people concerned about pressure, and the data largely supports this. A study that measured pressure during 22 different mat and reformer Pilates exercises found no statistically significant difference in average peak pressure between any of those exercises and a simple sit-to-stand movement.7PubMed Central. Intra-abdominal Pressure during Pilates: Unlikely to Cause Pelvic Floor Harm The researchers titled their paper with the conclusion built in: “unlikely to cause pelvic floor harm.” If you can stand up from a chair without symptoms, you can likely handle most Pilates exercises.
That said, individual variation was real. Between 6% and 25% of participants exceeded their own sit-to-stand pressure threshold during certain Pilates exercises, with the Reformer roll-up being the most common offender (about a quarter of women exceeded their threshold). So while Pilates as a category sits at the low-pressure end, specific movements like roll-ups push harder than others, and personal thresholds vary.
The High-Pressure End and What Drives It
At the other extreme, heavy resistance exercises generate pressures that dwarf anything seen in bodyweight or low-impact work. A systematic review of studies measuring pressure during weightlifting found that squats produced the highest readings, exceeding 200 mmHg, followed by deadlifts, rows, and leg presses in the range of 161 to 176 mmHg. Bench press produced the lowest among the resistance exercises studied, at roughly 79 mmHg.8PubMed Central. Systematic review of intra-abdominal and intrathoracic pressures initiated by the Valsalva manoeuvre during high-intensity resistance exercises The review’s authors recommended bench press and rows as more appropriate starting points for beginners or people with high blood pressure, and cautioned against heavy squats, deadlifts, and cleans until someone has progressively adapted to high loads.
A major driver of these extreme readings is the Valsalva maneuver, where you hold your breath and bear down against a closed airway. Lifters do this instinctively to stabilize the spine, and it works: the pressure spike acts like an internal brace. But the data show that the Valsalva alone raises abdominal pressure substantially, and it compounds with the pressure from the exercise itself. As lifting intensity increases, pressure climbs in step.9The Journal of Strength & Conditioning Research. The Valsalva Maneuver: Its Effect on Intra-abdominal Pressure and Safety Issues During Resistance Exercise For anyone trying to keep pressure low, learning to exhale during the effort phase of a lift rather than holding the breath is one of the simplest and most effective modifications available.
Body Position Makes a Bigger Difference Than Most People Realize
Before worrying about which exercise to choose, consider the position you’re doing it in. Research in clinical populations has shown that raising the head of the bed from flat to 30 degrees increased measured abdominal pressure by about 3.7 mmHg, and even a 15-degree elevation added roughly 1.5 mmHg.10PubMed. The impact of body position on intra-abdominal pressure measurement: a multicenter analysis A study in critically ill patients confirmed the same pattern, with the lowest rates of elevated abdominal pressure occurring in the fully supine position and the highest at 45 degrees of elevation.11PubMed Central. Effect of Body Position on the Development of Intra-abdominal Hypertension and Abdominal Compartment Syndrome in Patients in Critical Condition
The practical takeaway: exercises performed lying flat tend to start from a lower pressure baseline than the same exercises done seated or standing. A drawing-in exercise done supine starts at roughly 2 mmHg; the same contraction done standing starts at around 20 mmHg. If you’re in a phase of recovery where minimizing pressure is important, lying down versions of exercises give you a meaningful head start.
Hypopressive Exercises and the Gap Between Marketing and Measurement
Hypopressive exercises have been marketed since the 1980s as a way to actively reduce abdominal pressure while strengthening the pelvic floor. The technique involves holding specific postures while performing a deep exhale followed by a rib-cage expansion with a closed airway, creating a vacuum-like pull in the abdomen. The theory is appealing, but the measurement data tell a more complicated story.
A recent observational study that directly measured pressure during hypopressive exercises found that abdominal pressure did not significantly reduce during the maneuvers in either supine or standing positions. The average changes were small, roughly 1 to 3 cmH2O below resting levels, and the confidence intervals crossed zero in both postures, meaning the reductions were not statistically distinguishable from no change at all. There was also no correlation between the amount of pressure change and the degree of pelvic floor muscle activation during the exercises.12PubMed. Intra-abdominal pressure and pelvic floor muscle activation observed during hypopressive exercises performed in supine and standing: An observational cohort study
This doesn’t mean hypopressive exercises are useless. A randomized trial found that a multimodal program including hypopressive exercises significantly improved pelvic floor dysfunction symptoms, quality of life, and pelvic floor muscle strength and tone in women with conditions including urinary incontinence and mild prolapse.13PubMed Central. Effectiveness of Hypopressive Exercises in Women with Pelvic Floor Dysfunction: A Randomised Controlled Trial But that program also included pelvic floor muscle training, education, and home exercises, so teasing out the specific contribution of the hypopressive component is difficult. The honest summary: hypopressive exercises can be part of an effective pelvic floor rehabilitation plan, but they probably don’t reduce abdominal pressure the way their proponents claim. Their benefit may come from the pelvic floor muscle activation and postural awareness they encourage rather than from any unique pressure-lowering effect.
The “Pelvic Floor Safe” Label Problem
Many fitness programs and physiotherapists offer modified “pelvic floor safe” versions of common exercises: wider stances for squats, wall push-ups instead of floor push-ups, stability ball exercises instead of traditional core work. The assumption is that these gentler modifications produce less abdominal pressure. A study that directly tested this assumption found no significant difference in pressure between the “recommended” and “discouraged” versions of the same exercise across all types tested, including ball rotations, lunges, core work, push-ups, and squats.14PubMed. Assessing exercises recommended for women at risk of pelvic floor disorders using multivariate statistical techniques
The researchers concluded that performing the “safe” version instead of the conventional version may not actually protect the pelvic floor, and that the conventional version may not be harmful either. This is a finding that deserves more attention than it gets. It suggests that the specific exercise you choose within a given intensity category matters less than the overall intensity, your breathing pattern, and your body position. Swapping a floor push-up for a wall push-up might feel safer, but if the pressure generated is the same, the modification isn’t doing what you think it is. That said, modifications can still have value for other reasons: they may reduce joint loading, make a movement more accessible, or help with proper form. They just may not be lowering abdominal pressure.
Practical Considerations for Postpartum and Post-Surgical Recovery
For postpartum women dealing with diastasis recti, the evidence supports exercise programs that emphasize deep core stability, including transversus abdominis activation, pelvic floor engagement, and drawing-in exercises. A systematic review found that interventions combining traditional abdominal exercises with deep core stability work and pelvic floor training produced significant improvements in the separation between the rectus abdominis muscles.15Journal of Women’s Health Physical Therapy. Use of Exercise in the Management of Postpartum Diastasis Recti: A Systematic Review A randomized controlled trial found that both conventional and hypopressive abdominal exercise programs reduced inter-recti distance over six weeks, with no significant difference between the two approaches.16PLoS ONE. Effect of hypopressive and conventional abdominal exercises on postpartum diastasis recti: A randomized controlled trial The implication is that doing something structured and progressive matters more than choosing a particular exercise philosophy.
Deep core stability programs specifically designed for postpartum women have shown highly significant decreases in abdominal separation alongside improvements in quality of life.17PubMed Central. Efficacy of deep core stability exercise program in postpartum women with diastasis recti abdominis: a randomised controlled trial These programs typically begin with supine exercises focused on gentle activation with visual or ultrasound feedback, where the goal is to coordinate the deep muscles while regulating pressure rather than generating maximal force.18Physical Therapy Rehabilitation Science. The Effects of Postpartum Recovery Exercise Program Comparing to Core Stabilization Exercise for Postpartum Women: A Pliot Study
For people recovering from abdominal wall surgery, the picture is less clear. A scoping review of physical activity recommendations before and after abdominal wall reconstruction found that preoperative exercise programs showed improved outcomes compared to controls, but significant methodological flaws existed across all studies, making strong recommendations impossible. No adverse events were reported in any of the studies, which is at least reassuring.19PubMed. Physical activity recommendations pre and post abdominal wall reconstruction: a scoping review of the evidence The general principle of strengthening the abdominal wall to balance pressure and stabilize the repair applies after stoma surgery as well, where targeted exercises are thought to help prevent parastomal hernia formation.
Why Age Changes the Equation
The same exercise that feels comfortable for a 25-year-old can be problematic for a 60-year-old, and the reason goes beyond fitness level. A pilot study comparing pelvic floor anatomy in younger and older women who had never given birth found that levator bowl volume at rest was about 83% larger in the older group, and the shape of the pelvic floor opening shifted from a “V” to a more “U”-like configuration with age.20PubMed Central. Aging Effects on Pelvic Floor Support: A Pilot Study Comparing Young versus Older Nulliparous Women These structural changes mean the pelvic floor is less able to resist downward pressure from above, even in the absence of childbirth history. An exercise that generates moderate abdominal pressure might be well tolerated by a younger pelvic floor but overwhelm an older one. This is part of why exercise recommendations for pelvic floor health are not one-size-fits-all and why starting with low-pressure supine exercises and progressing gradually is especially important for older adults.
The Abdominal Binder Trap
Many people wear abdominal binders or compression garments during exercise, assuming the external support protects their abdomen or pelvic floor. The reality is the opposite. A study comparing elastic and non-elastic abdominal binders found that both types increased measured abdominal pressure, with non-elastic binders raising it by about 2.9 mmHg on average compared to about 1.1 mmHg for elastic ones.21PubMed Central. The effect of different types of abdominal binders on intra-abdominal pressure This makes mechanical sense: compressing the abdominal wall from the outside pushes inward on the same contents, raising the pressure inside. If your goal is to minimize abdominal pressure during exercise, a tight binder is working against you. There are legitimate medical reasons to use binders after certain surgeries, and they can provide a sense of support and confidence that has its own value. But wearing one with the expectation that it will lower pressure is a misunderstanding of the physics involved.
A Practical Hierarchy for Choosing Exercises
Pulling together the measurement data across studies, a rough hierarchy emerges for people who need to manage abdominal pressure during exercise:
- Lowest pressure: Supine drawing-in exercises, gentle transversus abdominis activation, diaphragmatic breathing while lying flat, supine pelvic floor contractions.
- Low pressure: Most mat and reformer Pilates exercises, slow walking, supine limb movements, seated exercises with exhale-on-effort breathing.
- Moderate pressure: Standing exercises, step-ups, light resistance training with controlled breathing, planks, curl-ups.
- High pressure: Jumping, running, heavy squats, deadlifts, any exercise combined with the Valsalva maneuver.
The boundaries between these categories are not rigid, and individual factors like breathing technique, body position, load, and personal anatomy shift exercises up or down the spectrum. A plank done in good form with steady exhale breathing sits in a very different place than a plank performed with breath-holding and a rigid brace. The same squat can be moderate-pressure with light weight and controlled breathing or extremely high-pressure with a heavy barbell and a Valsalva hold.
What the research consistently shows is that no exercise exists in a pressure vacuum. The goal is not to find exercises with zero pressure increase, because those don’t exist outside of lying perfectly still. The goal is to match your exercise selection to your current tissue capacity, starting with low-pressure movements and progressing as your strength, coordination, and tissue resilience improve. Breathing strategy and body position are at least as powerful as exercise selection for keeping pressure manageable, and the “pelvic floor safe” labels on many programs may be more reassuring than they are biomechanically meaningful.