(video 2:45) We also worked on back and knee flexibility.
Here are a few quick yoga exercises that you can do to regain flexibility in your back and knees.
Here is how I see these exercises working best for your body: If you have back or knee issues, for each movement only bend or stretch as far as feels good. If you do these exercises with out straining yourself (stopping your bend or stretch BEFORE it hurts) you will allow your body (muscles and joints) to relax and loosen. You will find that as we repeat each exercise you will naturally be able to bend or stretch a tiny bit more each time, eventually regaining your natural flexibility in that area. Celebrate each centimeter of improved flexibility!
If instead you push your body into the pain zone as you do these movements, your muscles will tense up to protect your body. You will not relax or loosen, and you will not regain flexibility. You will remain stiff. At best you will keep your injuries in place and at worst you could injure yourself more.
Of course, you may not agree with me, and you are welcome to use these exercises in the way is best for you. Whatever you do, enjoy being bendy!