A: Treadmills and stationary bikes are both great for cardio workouts, but they vary in a few key ways. Treadmills are... moreA: Treadmills and stationary bikes are both great for cardio workouts, but they vary in a few key ways. Treadmills are designed to simulate walking or running, while stationary bikes are designed to simulate cycling. Treadmills usually have a moving belt that you walk or run on, while stationary bikes have a stationary seat and pedals that you pedaled.
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