I saw a vid once where 1000s of tadpoles were swimming around, doing their level best to make it all happen. Most were content to muddle through even though food was scarce, but every now and then one of them would creep up on his buddy and eat him. Once he had a taste for it he just couldn't stop eating the other tadpoles and he turned into a giant, like 50x the size of the others, and he just did whatever he wanted. That's bodybuilding related. And it's right there in nature. And it works.
Please note: I'm not advocating cannibalism.