Learn how exercising your hips and glutes can help protect your knees during training and racing. Active.com is the leading online community for people who want to discover, learn about, share, register for and ultimately participate in activities about which they are passionate. Millions of active individuals visit us each month to search and register online for races, team sports and recreational activities; interact with others who have similar interests; start online training programs; and access nutrition, fitness and training tips.