How much exercise does a person need?

How much exercise do you really need? It depends on your lifestyle and fitness goals. Courtney Chagnon, 30, was an avid soccer player until she had knee injuries that forced her to stop playing. Now, the gym is her only option for exercise, which has been an adjustment. So, Chagnon sees Dr. Jasmine Toor, who specializes in primary care sports medicine at Mercy Medical Center. Toor helps Chagnon figure which exercises to do and how much.