Martina Navratilova, AARP’s Fitness Ambassador, gives tips and suggestions about conditions and treatments for prevention of knee pain.

http://www.aarp.org/health/conditions-treatments/info-06-2013/prevent-knee-pain-martina-navratilova.html

Scroll to the bottom of the page to follow her mini-workout to help you burn some calories, learn proper posture and work on your core.