Set the bar around waist height. The lower the bar, the more difficult the movement becomes.
Position yourself under the bar lying face up. Lie on the floor underneath the bar (which should be set just above where you can reach from the ground).
Grab the bar with an overhand grip, slightly wider than shoulder-width (palms facing AWAY from you).
Contract your abs and glutes, and keep your body a completely straight line. Your ears, shoulders, hips legs, and feet should all be in a straight line (like you’re doing a plank).
Pull yourself up to the bar until your chest touches the bar.