Lie on an elevated surface (which is higher than the length of your thighs) in a way that your legs are completely in the air.
2. Hold on to the bench with both hands to maintain balance. This is the starting position.
3. Bend your knees until your thighs are almost perpendicular to the ground.
4. Squeeze your glutes and lower back muscles to raise your legs back to the starting position.
5. Repeat this movement for the required number of reps.