The revolved extended side angle is a great way to open tight shoulders and also build core strength and leg strength.
To do the revolved extended side angle, start in a lunge, with your right foot forward and your knee bent at a 45 degree angle. Extend your left leg straight behind you, so that you’re resting your weight on the ball of your left foot and your entire right foot, which should be flat on the ground. Bend forward at the waist so that you can place your hands on both sides of your right knee. You will feel more stable if you keep your left leg straight – it will allow you to better balance your weight between the two legs. If this is too intense, you can lower your left knee to the ground.
Take several deep breaths and make sure you feel balanced. Slowly raise your right arm straight above your head. You should be able to draw an imaginary straight line from the tip of your index finger on your right hand down through your shoulder blades to your left hand, which should be on the ground next to the arch of your right foot.
Take several more deep breaths. If it feels ok, slowly lean back so that your right arm is now reaching back behind you, deepening the stretch. To come out of the stretch, slowly reverse all the steps you took. Switch sides and repeat.