Its when youre use to doing it then dont, thats when its noticed. I work with a couple of 16 year old atheletes who twice a week do an hours stretch. There PBs are dropping all the time 19 secs a year without injury or even a tweek, there competitors Ive been told are getting injured from a reliable source. this year Im not bothered about cardio.This year Im bothered about strentgh and muscle elasticity, growth is the aim with an eye on 2012 oylimpics. Dont work on the premise it could have been but. As ive said before if you had a Porche youd make sure it got good maintainance, but the most important thing you have YOU you cant be bothered with and without you theres no Porche