Every day, in gyms across America, people of all ages and shapes exercise on treadmills, bicycles, steppers, and elliptical machines that provide their users with digital readouts of how fast they are going and how many calories they are burning.
Every day, in gyms across America, people of all ages and shapes exercise on treadmills, bicycles, steppers, and elliptical machines that provide their users with digital readouts of how fast they are going and how many calories they are burning.
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