Joined crossfit two weeks ago and I am loving it. Reminds me a lot of the workouts we did when I played college football. I am so obsessed that the first day I could do maybe one or two DU's and was very disappointed. Been working on them twice a day and now can bust out 40+ in a row. The trick is to buy a good rope! I got one from http://rxjumpropes.com/
Also did my first muscle up yesterday. Felt pretty good about that!