When I was a serious runner 25 years ago I couldn't stand any sort of indoor exercise, particularly treadmills; I'd rather run outside in 0deg weather. I've joined a gym, but only for strength training which I definitely need. At least every 5 minutes you're hitting a different machine. The gym workouts will be in addition to cycling. When I travel on business I'll use an elliptical trainer out of necessity, but 20 minutes with CNN or Sports Center is about all I can tolerate.