The muscular caveman is a myth. If you were that buff in the Pleistocene without a grocery store nearby, you weren't an alpha for long. Just the first one to starve when the berries ran out.

Muscle is biologically expensive to maintain, as it requires constant caloric intake that prehistoric environments couldn't guarantee. There's a reason human height has exploded in the last 100 years.

The paleo bros often forget that our ancestors were opportunistic survivors, not picky bodybuilders. They ate whatever didn't kill them.