There are seven ways a human skeleton gets built, and most people never find out which one is theirs. Your shin against your thigh, your legs against your torso, how wide your frame runs at the shoulders — these bone proportions decide what your body was built to do, and no amount of training changes them.

In this video we break down all seven body builds, what each one is good at, and the evolutionary reason it exists. Sit down with a chair nearby, because you’ll be checking your own proportions as we go.

You’ll find out whether you’re built like a sprinter, a distance runner, a lifter, a swimmer, a gymnast, a jumper, or a rower — and why being bad at the sport you were made to play says nothing about the body you actually have.