Take a look at this

NikkiDerrig386

Take a look at this:
http://videos.howstuffworks.com/hsw/8187-investigating-human-biology-the-importance-of-exercise-video.htm

I think it is so cool what the human body can do..

NikkiDerrig386

Take a look at this:
http://videos.howstuffworks.com/hsw/8187-investigating-human-biology-the-importance-of-exercise-video.htm

I think it is so cool what the human body can do..