I am diagnosed with spondylolisthesis grade II 36%. L5-S1. I do not suffer much pain, only stifness in calfs and feet that allow me to develope normal life. My surgeon said that I can practice any sports that do not give pain to me. I am swiming 6 days a week and abds exercises. My concern is that the stiffness didn t dissapear, after swiming I feel better for an hour, and after that the stiffness start againd. Should I stop swiming? I swing 1750 meters 68 turns in a 25 meteres pool. Does the swiming turns, bend knees and hips, and 180turn over the water, hurt my back?