Position yourself under a sturdy horizontal bar (or rings, suspension trainer) set at roughly waist height.

Grasp the bar with an overhand grip, hands slightly wider than shoulder-width.

Extend your legs, keeping your body straight from head to heels (easier variation: bend knees).

Engage core and pull your chest towards the bar by retracting shoulder blades and bending elbows.

Keep elbows relatively close to the body.

Pause briefly at the top, then slowly lower back to the starting position.

Repeat for desired repetitions.