With the hand of the arm you want to stretch facing up towards the ceiling, hold onto the wrist with the other hand, and slowly bend the elbow with the assistance of the other arm as far as you can go, trying to push into resistance. Hold for 5s, gently ease out to take of the stretch, then repeat x10. Following this, turn the palm down to face the floor, continue to hold the wrist, and repeat the exercise by bending the elbow as far as possible with the assiatance of the other hand and the palm continuously facing down.

If you feel pain before you feel resistance, only push as far as you can tolerate.