How to perform leg raises properly:

  • Lie flat on the floor (on a mat) place your arms out to the side on the floor with your palms facing down.
  • Make sure that your head, legs and bottom are all in contact with the floor.
  • Engage your stomach muscles and grasp the sides.
  • Slowly lift your legs to a 90-degree angle, keeping your legs straight and not bending at the knees.
  • Pause for a second then slowly lower the legs back down.

Video lecture: