Skip the Gym: This 15-Minute Kettlebell Workout Strengthens Your Upper Body and Boosts Your Metabolism

You don't need to hit the gym to strengthen your arms, shoulders, back, and chest muscles: This 15-minute workout strengthens your upper body using just the best kettlebells and five exercises.

The workout should be done at a submaximal effort, meaning you won't be hitting your max for the full 15 minutes. But that doesn't mean you shouldn't aim for a high intensity: try to work at about a 7 or 8 out of 10 at all times, and increase it in the last few minutes.

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