Exercise is one of the most powerful, healthful habits you can adopt. Regular exercise is associated with longer life expectancy and a greater quality of life. Regarding gastrointestinal health, exercise is also strongly associated with improvements in GI function. Specifically, exercise has often been associated with greater GI motility and enhanced microbial diversity.

So, while exercise is typically associated with improved GI health, that's not always the case. People living with Gastroesophageal Reflux Disease (GERD) should be cautious of the possibility that exercise can exacerbate their symptoms.

Intensity describes how difficult the exercise is. Exercise intensity can be expressed in several ways, including exercise heart rate, subjective rating of difficulty (i.e., a 1-10 effort scale), power output (if you have equipment to measure it), or weight lifted (for strength exercises). Intensity is strongly related to the health benefits of exercise, as higher intensity typically yields greater improvements in fitness and health-related benefits. For individuals living with GERD, high-intensity efforts can worsen symptoms. 

At high exercise intensities, GI function is challenged due to shifts in neuroendocrine activity. During hard work, sympathetic neurons and the hormones epinephrine and norepinephrine are strongly activated, and the vagus nerve is inhibited. This results in a temporary reduction in blood flow to the splanchnic bed, increased intestinal permeability, and delayed gastric emptying.  

A great layperson’s definition is to define vigorous-intensity exercise as any pace you cannot sustain for longer than 15-20 minutes. In contrast, moderate-intensity exercise is a pace you can maintain for an hour. For GERD sufferers, a good guideline would be to focus on moderate-intensity sessions for most of your planned exercise, with only one or two higher-intensity sessions in the weekly plan. Also, space high-intensity sessions far apart (2+ hours) from heavy food intake. 

Exercise sessions lasting longer than one continuous hour also carry risks, as sustained exercise prolongs reduced blood flow to the intestines.  This reduced blood flow can damage the GI tract's mucosal lining. This damage is further exacerbated by increased stomach acid secretion, which also results from prolonged exercise. In sum, the best strategy for GERD sufferers to reduce their odds of a flare-up is to plan moderate exercise sessions of less than an hour for most weekly exercise bouts. 

Posture – In addition to exercise intensity and duration, your body position also affects the risk of GERD flare-ups. Specifically, exercises that pair bending movements with high intra-abdominal pressure greatly increase the risk of GERD symptoms. High-risk exercises for people with GERD include squatting, deadlifting, bent-over rows, and sit-ups. 

Impact – In addition to posture, mechanical jostling of the GI tract from high-impact exercises such as running has also been linked to increased GI symptoms (Al-Beltagi). A good solution for individuals living with GERD is to choose low-impact aerobic activities, such as cycling or swimming, rather than running.

Current obesity level – The risk of GERD flare-ups is higher in patients with a higher body mass index (BMI). This means that GERD patients with a higher BMI should be more conservative in their exercise choices, with a greater avoidance of high-intensity, high-impact, and bending movements.

As mentioned previously, strong evidence supports the use of low-impact, moderate-intensity, and duration exercise to reduce GERD symptoms. In addition, mild evidence (from one single-subject case study) shows a GERD patient eliminating symptoms through ~8 months of regular practice of a specific exercise. The exercise consisted of eating and swallowing in a kneeling position, with the head held between the knees while swallowing. 

The theory was that this exercise would strength-train the esophagus, as the patient had to fight gravity in order to swallow. Practicing this exercise daily (usually 2x per day) alleviated GERD symptoms, allowing the patient to discontinue medications and sleep without a pillow wedge. Again, it should be stressed that this is a single-subject case study, so these results have not been replicated, but I thought you might find it interesting.

Yes, certain types of exercise may temporarily worsen reflux symptoms in some people. High-intensity or prolonged exercise, high-impact activities, and movements that increase abdominal pressure or involve frequent bending may be more likely to trigger symptoms.

Moderate-intensity, lower-impact activities such as walking, cycling, and swimming may be better tolerated by people with GERD. Triggers vary, so choose activities that feel comfortable and build your fitness routine gradually.

Exercising too soon after a large or heavy meal may increase the likelihood of reflux, particularly during vigorous exercise. Allow time for digestion before higher-intensity workouts, and pay attention to how meal size, timing, and specific foods affect your symptoms.

Not everyone with GERD needs to avoid specific exercises. However, movements that involve significant bending or increased abdominal pressure—such as heavy squats, deadlifts, bent-over rows, and sit-ups—may aggravate symptoms in some people. Modifying the movement, intensity, or timing may allow you to exercise comfortably without eliminating it entirely.

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