I got my Trek 7.2 Hybrid after I sustained a stress fracture on my right foot from running. I couldn't run anymore so I had to do something except for lay about on the sofa. I really like biking but I live on flat land and I've got to go very fast on the bike to even get close to the kind of cardio I get running. Although I still like to bicycle, now that I am running again, I bicycle mainly on the weekends as a breather from running to give my legs a break. I get so much more out of running, and what's cool about it is it's almost free, all you really need is a good pair of running shoes.