I love phate89's idea of getting a road bike. You have so many more options. I have a road bike that I put on a trainer in the winter when I can't get outdoors to ride. The trainer came with a tension dial for added hill climbs. My heart rate gets way up there when I'm indoors on the trainer esp. during
HIIT workouts. Yup, I like the bike idea better too...and yes, what a great butt, thigh and leg workout.
