This is a great exercise for challenging the lower abdominal area. Remember, good form is really important, so be sure not to let your lower back arch when performing this exercise.
Lie on your back on the floor with your hips and knees bent to 90 degrees.
Find and maintain a neutral spine position throughout the movement.
Slowly lower one leg towards the floor without letting your Lower back arch and rise off the floor. Don’t let your foot touch the floor.
M Return to the start position, then repeat on the other leg.
If you find this exercise easy, it sounds like your abdominals are working well. Increase the challenge by lowering both legs together.
If this is proving too difficult, try not to lower your legs as far towards the floor. Even with a shorter range of movement you will still feel the benefits of this exercise.