>What the heck is the secret!? Am I doing something wrong!?!?
>;(
>
I don't know what the exact secret is, because there is an aweful lot involved in the move, and any weak link in the chain (shoulders, triceps, core) can be a sticking point,but some of these tips can maybe help:
Try doing negative push-ups (get in the plank position, then lower yourself down slowly. When you get to the bottom, hold if you can, then drop to knees to push back up.
Make sure your chest and back are spread wide when you do push-ups. I sometimes find it helps to go forward just a bit when lowering.
Instead of trying to work up to 'on-the-toes' push-ups from 'on-the-knees" push-ups (which I don't think really transfer that well), try different types of "on-the-toes" push-ups, with the hands on whatever level of surface you need: the wall (beginner); a kitchen counter; a bathtub edge; a step set at 10", the 8", then 6", then 4". It's just a theory of mine, but I think these might condition the core and the entire kinetic chain responsible for on-the-toes push-ups better than on-the-knees push-ups do.
As for the original question: last time I tried GS Chest/triceps, I needed to put longer rests between sets of the push-ups. But that's fine with me, because I'm going for strength and not so much endurance.