How to perform crunch exercise properly:

  • Lie flat on your back with your knees bent and feet flat on the floor, hip width apart.
  • Place your hands slightly either side of your head, do not lock your fingers or pull the head up.
  • Push the small of your back into the floor to engage the abdominals.
  • Tilt your chin slightly, leaving a few inches space between chin and chest.
  • Begin to roll your shoulders off the floor.
  • Your shoulders should leave the floor by about 4 inches and your lower back should always remain on the floor.
  • Hold for a moment at the top then slowly move back down.

Video lecture: