well I run - and I go to the gym.
I have to say that running helps with spin classes, spin classes help with running and weights help with BOTH. Same with the rowing machine helps with all three and then the paddling (dragonboat style) on top just helps all the others as well.
Cross training is the way to go - all exercises are good on their own, but mix them up, combine them and you're going to get results A LOT faster
