I think it's important to qualify this, at least a little bit. Life-long endurance athletes will still maintain muscle as they age, but you can't expect to tak

I think it's important to qualify this, at least a little bit. Life-long endurance athletes will still maintain muscle as they age, but you can't expect to take up casual cycling as an overweight, sedentary 45+ year old and have that sort of physiological change. Strength/resistance training is ideal if you are trying to push back against the effects of a sedentary lifestyle. All that said--most serious endurance athletes are realizing that they need to hit the proverbial weight room, at least at certain times during the year.