You wrote: “It is a very different feeling to be in a fat body that is moving a lot to one that hardly moves at all.”

This is true for all bodies. Good for you for taking the ridicule and mean judgements and using the insight they forced on you into what looks like a spectacularly successful app.

Are you doing any work on a bodyweight exercise game? I am old enough that I need to do weight bearing exercise so that my bones don’t collapse on my way to being an old lady; I LOATHE the exercises that I need to do, but I really do need to do them.