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If you feel as though your thighs are getting bigger than you'd like, you may be overdoing the cycling. "On an exercise bike, you're working a very specific group of muscles, and if you're hitting it hard four or five times a week, you will see development there," says Gary Sforzo, PhD, a professor of exercise and sport sciences at Ithaca College in New York.
The Solution: Unless cycling is your competitive event, cut it to once or twice a week and fill the gap with a variety of on-your-feet activities, from using the elliptical trainer to taking a dance class. "Every exercise affects your legs in different ways," Sforzo says. When you do cycle, lower the resistance level and increase the speed, Bushman suggests. "It's the overload on the muscles that causes the increase in muscle mass," she adds.