101athletics: Tuesday's and Thursday's Quick twitch & lateral movement.. #101athletics 101athletics.net sign up today become better tomorrow... #letswin Having quick feet is a combination of your brain and nervous system wanting to make a move and your fast twitch muscle fibers coordinating that movement with your body. During these movements your muscles are working but also your nervous system. It is your nervous system that is telling your muscles how fast to go and when to react. If your nervous system and muscular system is not well trained and on the same page then it could lead to an athlete wanting to make a move but his body not responding.