HOw do YOU add crossfit to your workout?

Hello, I've done crossfit wod on and off for several years now. I've also been watching the crossfit games for several years to and I am sure the athletes do a lot more than just the workout of the day. How do you add crossfit to your workout routine? Do you do the workout of the day and possibly add more? I'm wondering how these guys train to get in that kind of shape. I know they are most likely not natural and have youth on their side. I didn't find the right solution from the internet. References: http://www.board.crossfit.com/showthread.php?t=89221 video marketing