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A new study published in the journal Proceedings of the National Academy of Sciences states that a gentle run is actually less tiring and better for your muscles than a brisk power walk. Researchers had analyzed subjects walking and running at various speeds on a treadmill, and found that running roughly 4.5 miles per hour helps your muscles work more efficiently than walking does.

This all boils down to what is known as 'biomechanics,' which involves the medial gastrocnemius muscle (the muscle in your calf that attaches to the Achilles tendon). This works much more efficiently during a gentle jog compared to when you’re just walking, and provides more power with less effort.  So by jogging instead of walking, you’re not only helping the muscle release more momentum-boosting energy, you’re getting more of a workout by doing less.