The evolutionary biologist shows why our ancestors became two-legged, why we have opposable thumbs, why the backbone appeared, how fish fins became limbs, how even trees are locomotion-obsessed, and how movement has shaped our minds as well as our bodies. He explains why there are no flying monkeys or biological wheels, how dinosaurs took to the air, how Mexican waves began in the animal kingdom, and why moving can make us feel good. Wilkinson opens up an astonishing new perspective – that nothing in life makes sense except in the light of movement.