Find a sturdy horizontal bar or edge (e.g., low bar in squat rack, edge of a sturdy table) at roughly waist height.

Lie underneath the bar/edge, facing upwards.

Grasp the bar with an overhand grip, hands shoulder-width apart.

Extend your legs and keep your body straight from head to heels, engaging your core.

Pull your chest towards the bar by bending your elbows and retracting your shoulder blades.

Keep your elbows relatively close to your body.

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

Adjust the incline (body angle) to modify difficulty.