I just finished that workout 20 minutes ago. What fun! I was surprised to find I could power through those 16 pushups at the end of Chest. I thought I was fried, but I guess I had a little something extra kicking around in there.
I often think this. Now that I have a mirror in my workout room, I see all the faces I make and notice all the wrinkles (esp. the "11" lines b/w the brows). Yikes! Makes me know I could never be a background exerciser. I don't know how they keep a smile on their face - I know I couldn't!