I have a client that has advanced osteoarthritis of the knee, she wants to postpone surgery as much as possible and concluded with her doctor that strength training will be optimal. I want her to stretch her quads a few time a day, however prone and side lying quad stretch is hard to reach and causes pain, the same for standing traditional quad stretch. What stretch would you recommend? P.S Hip Flexor Lunge stretch is hard for her to get off then floor