Just finished day 2. Haven't worked out in many years, and pushed myself as much as I could. Had to use a chair for the chin ups, but you just have to go until you can't then bounce around a bit until they start the next exercise. I will try and avoid injury as stated above. I did some research on the recovery drink and the consensus seems to be that a glass of chocolate milk works just fine as it has the proper ratio of protein to carbs.
I think I'm going to do some sort of weekly diary on my website along with my golf stats to see if it improves my game......