This may come off as the randomest thing ever but while in london i was watching big brother and i saw couple of girls working out in the garden using the "Heads shoulder knees and toes SONG " since i started working out iv been using it TOO i do it for 15 mints and trust me strangly it works and it actually makes u sweat like a pig ! lol isnt that working out is about ? try it !
if your not familiar with the song watch this youtube vid ....
