well, you know what's not boring? stairclimber. know why? you don't have the friggin time to be bored! i was almost dead in 5 minutes. Started idealistically on lever 12 out of 20, nearly flew off that thing. it's vicious! i did 30 minutes on it cursing my very existence with every step, but it felt great afterwards.and my calves don't even hurt today!
of course, we went to a pub straight from there, so i imbibed all the calories back, but at least the first two beers were guilt freee.