The Straight Leg Raise targets the abdominal muscles as well as improving hamstring flexibility.

Straight Leg Raises are performed by lying flat on your back with your head pressed into the floor. Place your hands underneath your glutes to support the natural curvature of the spine. Whilst engaging your core, lift your legs off the floor, keeping them as straight as possible. Continue lifting them until you feel your glutes start to leave the floor as this will prevent you from bending your lower back.

If you would like to make the movement easier you can bend your knees and do the same movement with your knees bent. This could be a good alternative if you have any lower back discomfort.