You might think push-ups are relatively straightforward. You would be wrong. There are at least a hundred different ways to do push-ups and this graphic shows you all of them. You can even click on them to get a YouTube demonstration of how to do each one. Sourced from Stack 52.
This is super cool... I thought a while about how to DIY... could paper mache form around a ball and then pop/remove it, just would have to be a strong cast. Dollar tree has plastic chains around Halloween... box could be anything... If we ever get a cat, or small dog for that matter!