Are there any exercise for legs white medicine ball?!
Question: to devolop fast twitch muscle fiber
Answers: to devolop fast twitch muscle fiber
http://www.youtube.com/watch?v=El7cpndpB...
http://www.youtube.com/watch?v=HjeDXPJy2...
http://www.youtube.com/watch?v=8WXZwHlVj...
http://www.youtube.com/watch?v=rlkkq7Di4...