don't use it for exercising, but great in design for lounging on my lazyboy recliner to watch t.v.. Less sore backaches when i get up from watching t.v. after a few hours. i have it wrapped in an old sweatshirt so it won't dig into the leather furniture. Then i place it right under my tailbone when i sit down. What a relief and back pain is considerably less. It's not a cure but saves on pain meds for sure.