I learned this trick from Mark Sias, a professional gymnastic instructor. It will increase your vertical jump by 2 to 5 inches instantly. Trust me, it works! 

1. Test yourself and see how high you can jump.
2. Set a new goal for your vertical jump. Remember, a goal has to be reasonable and achievable.
3. Now close your eyes and imagine yourself exploding upwards to the new goal you have set. Imagine all the muscles in your legs getting stronger and bigger.
4. You should now focus on feeling lighter, loose and springy.
5. Hold this feeling for a few moment.
6. Repeat this out loud or in your head "I feel myself getting more powerful and much lighter"
7. Now you are ready to try that jump again.