from "Rust Out" by Dr. Royce Bailey, page 27

Men who are active are 30-50% less likely to develop ulcers than sedentary men.  The reason is exercise reduces acid secretion in the stomach, improves immune function and simply relieves anxiety.  The more a man works out, the less likely he is to develop an ulcer.

—Carol Macera, PhD, Researcher in a study of 11,000 people, Center for Disease Control and Prevention, Atlanta.  From BJSM.