I am an avid runner and train 30 to 50 miles per week. So far, I've been running for 20 years and plan to continue as long as I have the motivation. I am worried, though, that my knee joints are "wearing out" and arthritis will set in. Is this likely?
David C. Nieman, Dr.P.H., FACSM, is a professor and director at the Human Performance Laboratory, Appalachian State University, Boone, North Carolina, an active researcher, and author of several textbooks on health and fitness. Send your questions to email@example.com.