I actually new to road cycling and found it convenient that there's a bike path near my house that goes for many miles in each direction. I like cycling because unlike other things I've tried for exercise, you simply cannot quit and say "Ok that's enough I'm done". You actually have to ride all the way back just to get home. Sure you dictate the pace but unlike me on the treadmill or on the stationary bike, I can't just turn it off and be done with it when I'm tired. After going 20 miles to the end of the trail I'm exhausted and then it hits you that you have to ride 20 miles back home, against the wind this time. Good workout.