Work your arms and abs together with this plank variation. Start in a plank position holding a dumbbell in each hand. Open your feet wider than hip width for a stronger base of support. Lift your left arm behind you as high as you can. Bring the left arm back into plank to complete one rep. Do 10 to 15 reps with each arm. Use five- to 10-pound weights.

Work your arms and abs together with this plank variation. Start in a plank position holding a dumbbell in each hand. Open your feet wider than hip width for a stronger base of support. Lift your left arm behind you as high as you can. Bring the left arm back into plank to complete one rep. Do 10 to 15 reps with each arm. Use five- to 10-pound weights.

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