Sphincter muscles can be strengthened through targeted exercises, lifestyle changes, and in some cases clinical therapies. The approach depends on which sphincter you’re dealing with. The sphincters you can voluntarily control, like those around the urethra and anus, respond to exercise much like a bicep would. Others, like the valve between your esophagus and stomach, require indirect strategies. Most people notice measurable improvement within 12 weeks of consistent effort.
Which Sphincters You Can Actually Train
Your body has dozens of sphincters, but the ones most people want to strengthen fall into three groups: the urethral sphincter (bladder control), the anal sphincter (bowel control), and the lower esophageal sphincter (acid reflux prevention). Each works differently.
The external urethral sphincter and external anal sphincter are made of striated skeletal muscle, the same type of muscle in your arms and legs. They’re under voluntary control, meaning you can consciously squeeze and release them. This is what makes direct exercise possible. The internal portions of these sphincters are smooth muscle, controlled automatically by your nervous system. You can’t consciously flex them, but strengthening the external layer compensates significantly.
The lower esophageal sphincter (LES), the ring of muscle that keeps stomach acid from rising into your throat, is mostly smooth muscle. You can’t squeeze it on command. But the diaphragm wraps around it and acts as an external support structure, and diaphragm function can be improved through breathing techniques and postural exercises.
Pelvic Floor Exercises for Bladder and Bowel Control
Pelvic floor muscle training, commonly known as Kegel exercises, is the most effective non-surgical method for strengthening the urethral and anal sphincters. These exercises work by repeatedly contracting and relaxing the muscles that form the base of your pelvis.
A well-studied protocol calls for 3 sets of 8 to 12 contractions, each held for 8 to 10 seconds, performed 3 times a day. You follow each contraction with an equal or slightly longer relaxation period (a 1:1 or 1:2 ratio of squeeze to rest). This should be done daily for at least 15 to 20 weeks for full benefit. An alternative approach that also shows good results is simpler: 45 to 60 squeeze-and-release cycles spread throughout the day.
A progressive routine uses three positions to gradually increase difficulty:
- Lying down: 5 quick squeezes (1 to 2 seconds each), then 5 longer holds (5 to 10 seconds each)
- Sitting: Same pattern, 5 quick and 5 long
- Standing: 5 quick squeezes, then 5 long holds
Do this full sequence twice a day, morning and evening, for about 60 total contractions. Standing is harder than lying down because gravity works against you, so the progression builds strength gradually.
The most common mistake is squeezing the wrong muscles. You should feel a lift and tighten sensation around your urethra or anus, not tension in your abdomen, buttocks, or thighs. One way to find the right muscles: try stopping your urine stream midflow. That contraction is the one you want to replicate during training (though don’t regularly practice while urinating, as this can interfere with normal bladder function).
When to Expect Results
A randomized study found that pelvic floor muscle activity increased and urine leakage decreased after 12 weeks of training (20 minutes a day, five days a week). Some people notice subtle improvements in as few as 3 to 4 weeks, particularly reduced urgency. But meaningful, lasting improvement in continence typically takes 3 to 5 months of consistent daily practice. The 15 to 20 week timeline recommended in clinical protocols reflects what the research consistently supports.
The biggest predictor of success is simply not quitting. Many people stop after a few weeks because results feel slow. Treat it like any other strength training program: the muscle needs time to grow.
Strengthening the Esophageal Sphincter
If your concern is acid reflux rather than incontinence, you’re dealing with the lower esophageal sphincter. Because this muscle isn’t under voluntary control, the strategies look different.
Diaphragmatic Breathing
The diaphragm surrounds the LES where it passes through the chest wall, acting like a secondary clamp. Deep, slow belly breathing strengthens this support. In a controlled trial, diaphragmatic breathing nearly doubled the pressure at the LES during inhalation (42 mmHg versus 23 mmHg with normal breathing) and reduced the number of reflux episodes after meals.
The technique is straightforward: breathe in slowly through your nose, letting your belly expand rather than your chest rising. Hold briefly, then exhale slowly. Practice for 5 to 10 minutes, ideally after meals when reflux is most likely. Over time, this retrains the diaphragm to provide stronger baseline support to the LES.
Gravity-Based Swallowing Exercise
A more unconventional approach involves eating in a position where the LES must push food upward against gravity, essentially resistance training for the valve. The technique involves kneeling on a low platform, placing your forearms on the floor, and resting your head on your hands so your stomach sits higher than your throat. You take a normal bite, chew, then swallow while in this position. One documented case reported that after 68 days of doing this with part of breakfast and occasionally lunch, reflux symptoms resolved completely, including the ability to bend over without acid rising into the throat. This is based on a single case report rather than a large trial, so treat it as a promising technique rather than a proven one.
Foods That Weaken the LES
Certain foods directly reduce LES pressure, making the valve less effective regardless of how strong the surrounding muscles are. The main culprits are high-fat meals, alcohol, chocolate, peppermint, carbonated beverages, and caffeine. Spicy foods, citrus fruits, tomatoes, onions, and garlic can also trigger reflux by irritating the esophageal lining or relaxing the sphincter. Cutting back on these, especially in the hours before lying down, lets the LES maintain better tone.
Biofeedback Therapy
If you’ve tried exercises on your own without success, biofeedback therapy adds a clinical layer. During a session, sensors placed near the sphincter display your muscle activity on a screen in real time, helping you learn to isolate and strengthen the correct muscles. It’s particularly useful for people who struggle to identify or properly engage their pelvic floor.
A typical biofeedback course runs about 6 to 7 sessions over 4 weeks. In one study of 39 patients with fecal incontinence, about half (51%) showed meaningful improvement after completing therapy, with 15% experiencing major improvement. Biofeedback works best as a complement to ongoing home exercises rather than a standalone fix.
Electrical Stimulation
Neuromuscular electrical stimulation uses a small probe that delivers gentle pulses to trigger sphincter contractions, essentially exercising the muscle for you. This can be helpful when the muscle is too weak to contract effectively on its own or when nerve damage makes voluntary control difficult.
Sessions typically last 10 to 20 minutes and alternate between periods of stimulation and rest. Results have been mixed in clinical trials. One study found significantly more patients became symptom-free with electrical stimulation compared to biofeedback alone after 12 weeks. But other trials have shown no clear advantage over simpler approaches. It’s generally considered a second-line option when exercises and biofeedback haven’t produced enough improvement.
When Exercises Aren’t Enough
For urinary incontinence that doesn’t respond adequately to pelvic floor training, urethral bulking is a minimally invasive option. A gel-like material is injected around the urethra to add bulk and help it seal more tightly. About two-thirds of patients report symptom improvement afterward, and roughly one-third achieve a complete cure. These results hold up well over time, with up to 67% still reporting cure or improvement seven years after the procedure. Retreatment rates run around 23 to 34% within the first year, so some people need a second injection.
For severe anal sphincter weakness, surgical repair of the muscle or implantation of a nerve stimulator are options that a specialist may discuss. These are reserved for cases where conservative approaches have been fully explored.