Says Bob Harper, of Biggest Loser Fame:
I came from an endurance background of fitness that consisted of a lot of running, cycling and lighter resistance training. I created so much wear and tear on my body, not to mention that I was just getting bored with my workouts. I am 47 years old and am stronger than I have ever been with CrossFit. My metabolic conditioning is better, because I'm moving larger loads faster and for a shorter amount of time. There are some days that, with the exception of skill work in a session, my workouts can last only 10 minutes or less, and I love that.