Why should triathletes be worried? Because they are prone to dying suddenly.
Is it true that running a mile and walking a mile burn about the same number of calories?
As you know, bats are the only flying mammals, and, as their bodies became increasingly specialized for flight over the course of evolution, most species lost the ability to walk. Only a couple of exceptions are known, including a species of bat that lives in New Zealand and the common vampire bat of South and Central America. While other bats can only shuffle, these bats use their wings as forelimbs, so they can walk around like any other four-legged animals. Learn more on this Moment of Science.
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.