They measure strength

A woman in a black leather jacket dances in a dimly lit, smoky indoor space with other people in the background. Two men in a boxing ring face each other in fighting stances, one in red and the other in black, with a crowd watching behind the ropes. A small, dark-furred animal, likely a baby mole, emerges from a hole in the grass and repeatedly pushes clumps of soil out of the hole with its head.