When Bad Form Is a Real Pain

摘要

When stephanie Kays watched a videotape in slow motion of herself running, the reason for the knee pain that had plagued her for the past year was clear. "You could see how my legs rolled slightly inward when I struck the ground, so I was almost knock-kneed," says Kays, a 24-year-old speech pathologist in Madison, Wis., who runs five times a week to stay fit. The physical therapist who filmed her running on a treadmill, using several cameras positioned at various angles, determined that muscle weakness in her hips was causing excessive leg rotation and prescribed stretching and strengthening exercises to correct it. Nine weeks later, Kays reports that she is "virtually pain-free."