Not even a pitcher. An untrained adult male has an average throwing speed of ~45 mph. That's still going to hurt plenty, and many can throw much faster.
Kangaroo legs are big bands of elastic sinew that store kinetic energy on landing, and release it on the next jump. Humans have this too, with our Achilles tendons, but kangaroos dial it up to 13.
Also when they bounce, their tails and head go down on the up-jump, and up on the down jump, meaning their centre of mass barely changes height.
So they're basically giant biological springs. Once they're up to cruising speed, they barely use any energy. They breathe in sync with their jumps, so they don't use much energy for that either.
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u/joalheagney Mar 05 '25
Human's super power is walking. We can travel further and more efficiently than nearly any animal on the planet (kangaroos have us beat).
So if you're feeling down, take a walk.