Here's a truism: without lower body strength you can do very little. You cannot jump. You cannot run. You cannot kick. You cannot punch. You lose so much of your body's power as a matter of fact that the question has to be what can you do to increase your upper body strength? The answer is The Crusher workout. While it targets every major muscle group in your body, it focuses on the power of your legs, working quads, glutes and calves to make your lower body powerhouse as strong as it can possibly be. Maintain the height of your jumps every time and you will feel the burn from the first set.
Extra Credit: Jump up as high as you can every time.