Why Do I Leak During Workouts or When Lifting Weights?

You’re at the bottom of a heavy squat, bar across your back, breath held, and on the way up you feel it. A warm little spot. Now you’re finishing the rep and wondering whether gray leggings were a mistake.

Most of the time it’s a load problem. Not a character flaw.

The National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)¹ lists leaking during lifting, bending, coughing, or exercising among the signs of a bladder control problem. Cleveland Clinic² names lifting heavy objects, jumping, and running as triggers for stress urinary incontinence, the pattern where physical force on the bladder makes urine leak. “Stress” means pressure here. Not your nerves before a max-out day.

What a heavy lift does to the pressure inside you

Think of your torso as a can. When you brace, your abs, back muscles, and diaphragm squeeze that can from the sides and the top. Your pelvic floor, the sling of muscle that holds up the bladder and helps keep the urethra closed, is the bottom of the can. All that pressure lands there.

How big is the push? A small 2026 study³ had 11 active women lift with a pressure sensor in place. Squats raised the pressure inside the abdomen by a median of roughly 45 to 48 mmHg. Deadlifts raised it by about 24 to 25. On a leg press, which works the same legs while you lean back against a pad, it rose by about 4 to 11, and on a curl-up by about 5.5 to 7. The higher number in each pair is with a deliberate pelvic floor squeeze.

Same legs. Wildly different pressure.

Then came the part that stopped us. When the women deliberately squeezed their pelvic floor before each lift, that squeeze didn’t measurably outmatch the abdominal pressure in any of the four exercises, and the squat was the hardest one to hold it through. Eleven women is a tiny group, so treat this as a first look. But it shows how much a heavy squat asks of a muscle that never makes it onto the whiteboard.

Why squats and deadlifts top the list

A 2025 systematic review pulled together five studies covering 1,809 women in powerlifting and weightlifting. Between 41% and 48.8% of powerlifters reported urinary leakage, and between 36.6% and 54.1% of weightlifters did. Deadlifts came up most often as the lift where leaking happened (42.5%), followed by squats (36.3%). High loads, high reps, and competition were all tied to leaking.

So the leaks track the load. The heavier the bar, and the more times you move it, the more the bottom of the can has to hold.

Workouts without a barbell get there by a different route. Box jumps, jump rope, and burpees hit the pelvic floor with impact instead of one long squeeze. Jumping and running leaks each get their own article.

You don’t need to have had a baby for this

A lot of us file leaks under “postpartum stuff.” Then you’re 24, you’ve never been pregnant, and you’re leaking on double-unders.

Back in 2004, pelvic floor researcher Kari Bø reviewed the evidence in Sports Medicine and found that leaking during sport among young elite athletes who had never given birth ranged from 0% in golfers to 80% in trampolinists. Her review argued that elite athletes may need much stronger pelvic floor muscles than other women.

Twenty-two years later, the picture holds. A 2026 umbrella review and meta-analysis in Sports Medicine put urinary leakage at 39% of adult women athletes, in a pool of studies where, on average, 93.9% of the women had never given birth.

Pregnancy and birth do raise the odds, and the 2025 lifting review flagged age and body weight too. NIDDK¹ adds menopause, pelvic organ prolapse, constipation, and a long-lasting cough as things that can cause or contribute to leaks. But heavy training can bring out leaks in a body with none of those.

So is it my breathing? My belt?

Gym wisdom loves to blame one bad habit, usually holding your breath or cinching a lifting belt.

Does holding your breath raise the pressure? Yes. Does it explain who leaks? Not in the one study we found that checked.

In a 2026 study⁴ of 84 French weightlifters, 60.7% reported leaking. The women who leaked didn’t differ from the women who didn’t in belt use, in which part of the breath they lifted on, in their best snatch or clean and jerk, or in how often they trained. Age, body weight, and birth history didn’t reach statistical significance either.

Eighty-four lifters doesn’t settle anything. It does push back on the idea that you’re leaking because of one bad habit you keep repeating… and that you’d stay dry if you’d only fix it.

Why more training can mean more leaking

The 2026 Sports Medicine review turned up something worth knowing if you train a lot. Each extra hour of training per week went along with about 6% higher odds of leaking.

Our read is total load. Six hard hours a week puts a lot more reps on your pelvic floor than two.

These studies were snapshots in time. They show a link. They can’t show that training caused anyone’s leaks.

Is it a leak, or an urge?

Pay attention to when it happens. Leaking at the hardest moment of a lift, driving out of the hole or pulling the bar off the floor, points to pressure. A strong, sudden need to pee halfway through class that doesn’t wait for the bathroom points somewhere else, to what NIDDK¹ describes as being unable to hold urine after a sudden, strong urge. Some women have both.

Urge and mixed incontinence get their own articles. A clinician can tell you which pattern fits.

What helps

Our take: leaking under a barbell is a reason to train your pelvic floor. That doesn’t automatically make it a reason to quit lifting. NIDDK¹ lists physical inactivity among the lifestyle factors that make bladder leaks more likely, so giving up the gym isn’t the fix it sounds like.

Pelvic floor muscle training has the strongest evidence. In a 2018 Cochrane⁵ review of 31 trials, women with stress incontinence who did it were about eight times more likely to report that their leaking had gone away than women who didn’t, 56% versus 6%. Cleveland Clinic² says it can take four to six weeks of regular Kegels to see symptoms improve. Bø’s review called it first-line treatment and noted it has no serious side effects. Most of those trials studied women in the general population, though, not competitive lifters, and a lifter’s pelvic floor has a much bigger job.

That’s why we’d put a pelvic floor physical therapist ahead of a forum thread. Someone who can assess your squeeze in person can help you build it toward what you lift, and tell you whether to ease off the loads while you do.

Lifters also use a move often called the Knack, tightening the pelvic floor right before and during the effort. That’s the squeeze the 2026 pressure study³ tested, and it didn’t outmatch the pressure in any of the four lifts. So it’s worth practicing, but don’t count on it alone under a heavy bar. Building it into your sets gets covered in our guide to lifting weights without leaking.

For high-impact training, Bø’s review notes that a vaginal device, such as a tampon or a pessary, may reduce leakage during activity for some women. Tampons aren’t designed or labeled for bladder leaks, so ask a clinician first, and follow the package directions on absorbency and wear time. A pessary is fitted by a clinician. In the meantime, a pad or absorbent underwear made for urine can catch the drops while you work on the cause.

If that isn’t enough, Cleveland Clinic² lists other options a clinician can discuss, including vaginal estrogen after menopause, bulking injections, and sling surgery.

When to get checked

Don’t wait if

1. Emergency

   Call 911 or your local emergency number if you have back pain along with new trouble controlling your bladder or bowels, numbness around your genitals or bottom, or weakness or numbness in both legs. The NHS⁶ treats that combination as an emergency.

2. Urgent

   If you can’t pee at all, go to urgent care or the ER. Get seen the same day if back pain comes with feeling hot, cold, shivery, or unwell, which the NHS⁷ treats as urgent.

Cleveland Clinic² advises seeing a provider as soon as stress incontinence symptoms show up. By its description, a few drops during squatting or heavy exercise counts as mild. More than a tablespoon during easier movement is more severe.

Make an appointment soon if you notice any of these:

• Heaviness, pressure, or a bulge in or coming out of your vagina, which the NHS⁶ lists as signs of pelvic organ prolapse
• Leaks during light, everyday movement
• Blood in your urine
• Burning or pain when you pee
• Peeing eight or more times a day
• A bladder that never feels fully empty

If you’re pregnant or postpartum, check with your clinician before starting a new pelvic floor routine or going back to heavy lifting.

Your pelvic floor has been part of every heavy squat you’ve ever done. It’s about time it got its own spot in the program.