pick your core-strengthening planks to the next level while toning your arms and back - you're going to feel the burn with this move!Meet the arm circle plank. Barry's Bootcamp trainer Tommy Stracke loves incorporating this plank variation into his workouts and his clients' workouts because it gives the abs an added challenge beyond the standard plank. "It creates instability,which challenges your core muscles and helps you gain strength and balance," he said. Here's how to effect it:In a plank position, or reach your left arm back and then circle it overhead,bringing your palm back to the floor; repeat on the other side. This counts as one rep.
Complete five to eight reps, keeping the core steady and the belly button pulled up toward the spine.
The wider your feet are, or the more steady you will be. effect not let your pelvis drift toward the ceiling.
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Source: popsugar.com