Start in plank position, placing your palms on a stable surface like a wall, chair, kitchen counter, back of couch, or bench. Keep your arms and legs straight with weight on your toes, shoulders above the wrists, and core engaged.
Take a breath in, and as you exhale, bend your elbows out to the sides and lower your torso in one piece (it's common to leave your pelvis behind, aka sticking your butt out) toward your hands. Stop when your shoulders are in line with your elbows. Inhale and straighten your arms to return to your starting position. This counts as one rep.