Push-Up Start in a plank position, with your shoulders over above your wrists and your body in a straight line, abs engaged. Bend your elbows and slowly lower your body toward the ground, until your arms are at a 90-degree angle. Hold this position for at least two counts. Push back up to starting position, keeping your core tight throughout the movement. Don't allow your shoulders to round or your back to hunch. Image Source: POPSUGAR Studios