"Fat is one of our body's favorite sources of energy," says Brookes. "The more you run, the more your body prepares itself for your next run. You will actually start to hold on to more fat,"
"The more time you spend running, the better you become at running and the more efficient you get the less energy you use and the fewer calories you burn," says Brookes.
According to him, running is also bad for joints. "When you run, two-and-a-half times your bodyweight is transmitted through your joints."
"If that force is repeated over and over, eventually your weakest joint will give out. Usually the ankles or the knees are the first to go," he adds. Contrary to popular belief that any exercise will speed up your metabolism, running can, says Brookes, do the opposite.
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