This exercise is to stretch out the external oblique muscles. Start by placing the arm of the side to be stretched out to the side on the ground. You can hold a weight or dumbbell in your hand to anchor yourself down. Then bring both knees up to your chest and twist them down to the opposite side. Use your other hand to hold your knees down. Hold the stretch for 30 seconds for 3 sets for both sides. If you are experiencing any acute or sharp pain consult your Physiotherapist before trying this exercise.