
Originally Posted by
Tonko
Huge difference. You think you're hitting muscle failure now, but you might not be. On the 4th set, you go, until you can't complete a full range of motion on a rep. But keep going, as far as you can go, until you can't move the weight beyond the starting position at all. Even then, try, and push for 5 seconds. You'll notice a difference, I used to do 3 sets as well, started seeing very nice gains on both strength and size after a friend clued me in.
To repeat: First 3 sets gauge if you're using too MUCH weight. If you can't get through them all, decrease the weight in 2 days when you try it again. You should just barely be able to squeeze out the last set.
4th set tells you if you're using too little weight. If you complete it, even with max effort and barely making it, you need more weight next time.
And be sure you're doing slow, even reps. "Explosive ups" as they're called, are counter productive. They break form, elicit the assistance of muscles not being targeted, and cheat your body out of the full effort in a rep. Depending on the exercise, you want 2 second up, 2 second down. The negative motion is equally as important as the positive motion.