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Athletes commonly struggle with gastro-intestinal (GI) issues, ranging from nausea to diarrhea. Athletes who participate in running sports that jostle the intestines or exercise in the heat for prolonged bouts are particularly prone to GI distress.

When people gain weight, they also gain muscle as the body adapts to be able to carry the heavier load. Hence, people with obesity tend to have a lot of muscle—more than leaner people!

When runners want to improve, attention naturally turns towards training. More consistent mileage, smarter speed sessions, strength work and better pacing can all play a role. Yet the hours spent running represent only a small part of the week.