This ball has been such a relief to my back pain! I’m currently 38 weeks pregnant and I been using this ball for two weeks now, and the healing it’s done for me so far has been amazing.I make sure to use it at least once every day, if not more. While sitting on it it instantly takes the pressure off your back, and if you incorporate hip movements/workouts it works wonders for that hip pain as well.I’m 5,4 and I purchased the L ball. It gives me that perfect 90 degree angle at the knees.I definitely recommend to anyone who is pregnant! I’m also sure that I will continue to use the ball post-pregnancy to get my pre-baby shape back ASAP.