this is straight form "Men's Health November 2006" (awesome magazine..) -Q:How can i boost my vertical leap? Mark Verstegen (MH 68) "Your quads and hamstrings are your primary thrusters. But it's equally important to awaken and strengthen assisting muscles - your calves, the muscles around your hips, your glutes. You'll find a complete, four-part plan for boosting your vertical at ******.com," (i got it right here for you, i thought i should check it out myself haha) 1] Forward Lunge (forearm-to-instep) What it does: Powers up your calf muscles and helps extend your hips by loosening your hip flexors and ankles. How to: Take a large step forward with your left leg into lunge position. Bend down and place your left elbow against the instep of your left foot while keeping your right knee off the floor. Pause, then place your left hand outside your left foot while keeping your right hand on the floor for balance. Now, push your hips toward the ceiling and lift the toes of your left foot toward your shin. Finally, stand up and stride into the next lunge. [2] Squat Jump What it does: Teaches your hips, knees, and ankles to store and release energy. In other words, builds spring-loaded muscle. How to: Stand with your feet wider than shoulder-width apart, hands on head. Sit back until your thighs are parallel to the floor, then explode upward, extending your ankles, knees, and hips. Land softly with knees bent and immediately descend into your next squat. [3] Vertical Granny Toss What it does: Forces your body to elongate and improves your power in the muscles surrounding your spine as well as your trapezius and shoulders. How to: Stand holding a medicine ball in front of your thighs, arms straight. Dip at the knees, then toss the ball overhead and back. Follow through so your thumbs pointing directly behind you. Run down the ball and repeat. [4] Romanian Deadlift What it does: Strengthens your hamstrings and glutes, two common weak points that contribute over 30 percent of your total leaping power. How to: Stand holding a dumbbell in each hand (palms facing your thighs). Keeping your knees slightly bent and your back naturally arched, push your hips back and lower the weights until they’re just below your knees. Then push yourself back up." i hope that helped.. damn i do miss playing volleyball in highschool.. Good luck

you will never be able to jump as high with 1 leg as you can 2 because the stronger your single legs get, that will strengthen your 2 leg jumps..

I recommend practicing "bounding" (a high skipping movement, bounding high in the air off one foot)

You want to combine strength with quickness. Try squats and lunges for strength and plyometrics for quickness. In order to jump really high you need power. Power consists of strength and quickness. The ability to move heavy objects in a short time is powerful. Moving your body quickly allows you to jump high. To learn more check out http://www.increase-vertical-jump-higher.com