This webpage scrolls to the right ----> I hope you notice that the people in these photos are wearing helmets. Any body part not inside the pad could be subject to striking objects and getting hurt. Best done outside in a field. Since I realize that advice will probably be ignored - at least spot the poor chap as flails about the room.

This is really a unique workout. There are several strategies I have seen work but I'll skip the beta. Half the fun is figuring out how to do it. The only rule is to keep body parts sticking out both ends.

An interesting twist to the crashpad game is a version that allows use of one of those workout balls. I'm not sure the use of this "aid" makes the task any easier - but it does add to the humor element.
There is no real need to describe this game - just try it and you will understand the concept.

Lay a pad down and lay down on the pad with your head and arms out one side and your feet out the other. Have someone fold the pad over and buckle you inside. Now. Try to stand up.

The difficulty depends on what make of pad you use. Standing up in each pad is like doing a different offwidth boulder problem. Some pads aren't too bad. The classic cordless pad for example is about V2. Some pads, like the Mondo are projects and may not "go" at all. Difficulty also depends on how "new" or stiff the pad is, and how tightly you are strapped in. Stiff pads make it difficult to maneuver your body through the strange gyrations needed to do the pad trick.
CRASHPAD GAMES

The simplest crashpad game is called "Stand up" and that's quite literally what it is. You "wear" the crashpad such that your head and arms stick out the top of the pad and your feet stick out the bottom. With the crashpad buckled, start off laying down and try to stand up. That's all there is to it. The only rule is you must maintain body parts out both ends of the crashpad.