The basic push-up was one of our First 5 Moves, and although useful, today we’re making them a bit more challenging. By elevating our feet, we are forcing more work onto our chest, shoulders, and our core. Start in a basic plank position, with your feet elevated a few inches off the ground (no higher than a bench). Start the movement by bending your elbows and lowering your chest to the ground. Your elbows should be at a 45-degree angle, not flared out or tucked to your sides. Press the ground away from you to extend your arms, and return to the top of the move.