by Men's Health, Courtesy of the editors

It's the Simplest Total-Body Workout Ever

Here's a new approach for the new year: Use one dumbbell instead of two. By not tracking reps in this fast routine, you'll focus on form and trigger more muscle fibers, says creator C.J. Murphy, co-owner of Total Performance Sports in Everett, Massachusetts. Complete the circuit by doing each exercise for 45 seconds. Rest 1 minute. Repeat 2 or 3 times.

Start with a 15-pound dumbbell. Add weight as you progress, but don't go so heavy that you need to rest between exercises.

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