Single Arm Long Arm Planks Start in the push-up position. Spread your feet wide and take one hand off the ground, placing the arm alongside the body. The key is to keep the hips still and square. According to Rivera, the arm that's off the ground forces the opposite side to work harder and stabilise. Hold for 30 seconds each side. Repeat moves 1-5 again to complete the 10-minute EMOM circuit. Click here for more health and wellness stories, tips, and news. Image Source: POPSUGAR Photography