Athlete’s Bloating Stomach

Patient: I am 6’1 and weigh about 180 pounds. I compete in Ultra Marathons, and Triathlons. My question is, why does my stomach bloat out? When I suck my stomach in to flex, it comes right back like normal. Does this mean I have intestinal worms, or am I lacking something vitamin wise?

Symptoms: N/A

Doctor: