Just watched this and found it very interesting.
http://www.bbc.co.uk/iplayer/episode/b01cywtq/Horizon_20112012_The_Truth_About_Exercise/
Even if you think you know it all I bet you will learn something.
http://www.bbc.co.uk/iplayer/episode/b01cywtq/Horizon_20112012_The_Truth_About_Exercise/
Even if you think you know it all I bet you will learn something.