Lie flat on your back with your legs extended and your lower back pressed into the floor. Hold a pair of dumbbells or kettlebells directly above your shoulders, arms fully extended, and wrists stacked over your shoulders.

Lift your legs toward the ceiling while keeping them straight and together. Your lower back should stay pressed into the floor.

Lift until your legs form a 90-degree angle with your torso, then gradually lower your legs back down, stopping just before they touch the floor. Pause briefly, then repeat for the desired number of reps.