Gomukhasana : I’ve just borrowed the arm element from this posture – again because it ‘s easy to do in the office. Raise your right arm, keeping your elbow straight and close to your head, and extend through your fingers. Swing your left arm behind you and reach as far up your back as you can. Bend your right elbow and, if your fingers overlap, hold them. If they don’t then take hold of your clothing, so you can anchor into the position. (You could also use a tie or scarf to hold). Keep your chin parallel to the floor and look forward and avoid reaching your head forward. Breathe deeply and feel the space in your chest. Try to ease your right elbow up and back and your left shoulder back. Repeat on the other side.
It’s very common for one side to be much easier than the other, but if you practise this often, they will even up.