Start in a plank position, placing your palms on the chair or bench in front of you and your feet out straight behind you (you should be on the balls of your feet). Keep weight on your toes, shoulders above your wrists, and your core engaged.
Keep your elbows close to your sides as you lower your torso toward the chair until your arms form two 90-degree angles.
Push through your hands and return to the starting plank position. This counts as one rep. Do 10 reps.