If you walk or run regularly as your form of cardio, it's important to exercise on all types of surfaces. Doing so offers varying degrees of shock absorption for your joints and feet, so mixing your exercise terrain strengthens the muscles around your hips, knees, and ankles in different ways. Instead of sticking to the treadmill all the time, try to alternate your workouts between pavement, grass, dirt trails, sand, track, and your beloved treadmill.

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