I never knew how hard I was riding until I used my brand new Timex Ironman HRM today. 60-70% feels terribly slow, yet it's supposed to be the best for fat burning. I could stand to lose about 10lbs, but do I gain anything aerobic from exercising at such a low level?
Next question: If I have bigger muscles wouldn't that make it easier to move my bike? So if I build leg strength, would I find it easier to ride faster at a lower HR?