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Treadmills are a staple of every gym, but not everybody loves them. For some, the monotony of walking or running in place makes it the “dreadmill.” But there’s a good reason to use the machine, says ...

Cardio (also called cardiovascular exercise or aerobic exercise) is an important part of staying physically fit. During cardio, your heart beats faster, pumping oxygenated blood throughout the body.

Interval running condenses the powerful effects of regular running into shorter, high-intensity bursts. Research shows it can improve cardiovascular health, regulate blood sugar, and reduce body fat ...