"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Cherie Gruenfeld, 81, is an Ironman Hall of Famer who completed her first marathon at age 42. She retired ...
Knee pain is frustrating, limiting — and common. By 55, approximately 1 in 4 adults suffer from knee pain, which can be caused by arthritis, overuse injury, tendonitis, and even simple wear and tear.
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