Here's what CrossFit is, why people are drawn to it, and what health benefits are associated with doing it. What are the CrossFit Games? What 5-time champ Mat Fraser told us about the competition.

CrossFit isn’t for you if you’re dealing with a knee or back injury. Recover first. Then get your body back in shape. After that point, if your doctor says it's OK, you can give CrossFit a try.