I tried New Sensei's push-up regimen today. I went through 18 cards of a deck, and did about 157 push-ups until I finally couldn't finish the 19th card (the joker). (Only 36 cards to go.) When I moved onto the elliptical machine right afterwards, I was primed--my heart rate was already raised, it was in cardio range in no time.
I did hands-wide push-ups (the easiest for me), shoulder-width push-ups, and a few diamond push-ups. Man, are my arms tired. This is a lot for a middle-aged guy.
I'm going to be surprised if my arms recover enough to give a decent showing in martial-arts class Tuesday night, which will be embarrassing.