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Lie on a stability ball with your feet flat on the floor, dropping your hips downward slightly toward the floor until your torso is angled as if you were on an incline bench. Hold a dumbbell in each hand just outside your shoulders, elbows bent and arms forming a 90-degree angle with your body — your triceps will be in contact with the ball at this point. From here, powerfully press the dumbbells upward toward the ceiling, stopping when they come to an inch or so away from each other above your upper chest, then slowly bend your elbows to lower the weights back down to the start.