While pushing one button and doing a mindless 30-minute run may seem like the most painless workout option, it may actually be sabotaging your routine. According to the experts, the body responds better to a variety of hard running and recovery. Here, Gina Garcia starts her work out with a 15 minute warm up on the treadmill in University Park, Texas, July 25, 2012. (Ron Heflin/Dallas Morning News/MCT)
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