Are Opossums related to rats? Why do they enter a comatose like state?
Playing dead doesn't seem like much of a strategy, but it works for the opossum, commonly known as the possum.
But unless you have a body like a kangaroo, the amount of energy needed to hop regularly when your mass is above a certain amount will be more than you can afford. Try hopping to work tomorrow instead of walking and see how long you can manage it.