narlus said:if you want a good workout in a short amount of time, then don't bother w/ a road bike...imo, a hardtail w/ slicks is fine. hell, since it's less efficient than a roadie, you will get a better workout.
...........or
if you get a roadie and do group rides with people that are slightly faster than you, you will stay motivated to bust your ass to keep up ... definitely makes a nice 2 or so hour workout