Amino Acids

http://www.livestrong.com/article/548043-how-to-get-hgh-amino-acids-naturally-with-food/

http://www.livestrong.com/article/541441-amino-acids-for-hgh-enhancement/

http://www.livestrong.com/article/448094-how-to-naturally-boost-hgh-levels/

https://www.youtube.com/watch?v=mv_izU5QW2A

http://www.fitday.com/fitness-articles/fitness/cardio/the-benefits-of-sprinting-and-speed-training.html