So you want to be all environmental or you just want to get fit. Well a guarenteed way to save the planet is to off yourself by riding out from behind a truck into the path on an oncoming car and try to ride up the road towards them.

The only reason they weren't smashed to bits is because I'd slowed down to go over the speed bump and I still locked up the breaks to miss them. Grow half a brain!
Maz