Eccentric Push-Ups Start in a plank position with your arms and legs straight, shoulders above your wrists, core engaged. As you inhale, slowly bend your elbows, keeping them close to your sides as you lower your body toward the floor. When your shoulders are in line with your elbows, drop to your knees. As you exhale, press your palms into the floor and straighten your elbows, keeping your core tight. Get back into a plank position, with your knees off the floor, and continue this movement for 40 seconds. Image Source: POPSUGAR Photography