I love this! Maybe even add a punishment outside of this. Like a Scarlett Letter type deal. Stitch a letter or a badge depicting their failure. Maybe a hippo or a whale. I feel bad for the actual animals so it has to be something along those lines but negative. Even a cap or a badge that says "I am a weight loss failure" or "I refuse to take care of my body."  Have some sort of gps in the badge and make an app that can track the losers so they can be publicly mocked and laughed at.