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Practice your footwork without the ball. Always follow through. Do strength training exercises.
When you're just learning how to spike, it's important to get the footwork down. Practice enough that you know the volleyball approach well enough to do it in your sleep. Remember to start behind the attack line and move toward the imaginary ball. Focus on mastering a fast, powerful approach. Follow through is essential for a powerful strike, because without it, you're forced to halt your hand's momentum before it has had the chance to really attack the ball at full speed. The key is to follow through without touching the net. Bend your elbow during your follow through so you can keep your arm close to your body instead of reaching into the net. Serious volleyball players do special exercises in order to build up the calves, abs, rotator cuff muscles and other muscles that allow them to jump powerfully into the air. Work with your coach to start an exercise routine that will help you jump higher. Here are a few exercises to try:    Do push ups. You can either start with your hands placed on the ground or on an exercise ball, which also helps your shoulder stability. Do three sets of fifteen pushups each, increasing reps as you gain strength over time.  Do a two-hand overhead ball slam. Use a medicine ball (a heavy volleyball-sized ball). Standing with your feet shoulder-width apart, use both hands to swing it up over your head, then slam it down on the ground. This works out your shoulders and arm muscles.