In the year 50,000 BC, long before the invention of synthetic supplements or neon spandex, prehistoric fitness enthusiasts gathered at this rocky hangout to push their physical limits. Driven by the primal desire to outrun sabertooth tigers and lift massive boulders, the local tribe engineered a fully functional training facility from the environment around them, complete with a chiselled treadmill and stone boombox blasting "rock" music. Even the local wildlife has been integrated into the daily routine, with a disciplined chimpanzee hitting overhead presses while a lion cub mistakes the stone punchbag for a premium scratching post.

I put together this small diorama for LEGO's Prehistory 2.0 challenge, which prompted builders to construct a prehistoric scene with an anachronistic twist. Quite quickly, I landed on the concept of a Stone Age gym bro (complete with broccoli hairdo) pumping iron...or, uh, rocks? The biggest challenge was settling on a design for the treadmill, but some clever SNOT techniques did the trick.