Illustrated tutorial on side jackknife movements

Target exercise areas: Abdomen, oblique muscles

Starting position: Lie on your side on the floor with your right shoulder on the ground. Stand with your legs straight and your body in a straight line. Place your right hand on your abdomen in a comfortable place and clasp your left hand behind your head.

Action essentials: Tighten your abs and lift your torso with your left leg upward, stretching your obliques. Contract your obliques and return to the starting position. Then alternate body directions

Tip: You can use ankle weights to make them even tougher!