My Son stopped having meltdowns when we started taking him to Hippotherapy two times a week. ( It's O.T. on horseback.) The movement helped him greatly. If this isn't something you can or want to try, I suggest trying other activities that have that kind of movement, such as having your kiddo sit on a ball and bounce up and down, jumping on a mini trampoline, etc... Another thing that helped our kiddo, was squeezing himself through a stretchy fabric tube while my Husband and I each held the ends of the tube. They're costly, but I made one myself for a lot less than they sell for. <3