Triceps Stretch

This stretch improves mobility and circulation. You can use a towel to deepen the stretch. 

Reach right arm above you and bend elbow, palm reaching down the back. Grab the right elbow with the left hand bringing it close to the head stacking the right elbow above right shoulder. Lean back into right arm. Sit or stand up tall, keeping head lifted, and chest open. 

Grab the towel with the right arm, as you bring it overhead bend at the elbow. Reach the left arm behind the back and grab the remaining towel. Give it a tug by pulling the left hand down to stretch the right triceps and shoulder. This modification can be helpful to improve the stretch by slowly closing the gap between the hands.  

Variation (Ultimate Goal) - Bind the hands together behind you. If the right elbow is to the sky, keep it towards the head and in line with the shoulder. Focus on sitting up tall leaning back gently to assist in proper form.