Place your hands on a wall just wider than shoulder width and move your feet several inches away from the wall. Your arms should be fully extended. Keep your core braced and a neutral spine so you have an unbroken line from your head to your toes. This is your start position. Keeping you core braced, lower your chest towards the wall by bending your elbows until your chest is as close to the wall as possible. Pause, then press away from the wall from your chest and shoulders, straightening your arms as you return to the start position. Repeat for the required number of reps (or time).