the.com/horseback
Humanity's first 70 mph, achieved on something that mostly wants to eat grass.
means On the back of a horse — the position you occupy when riding one, as in 'on horseback.'
from A plain Old English compound: 'horse' (hors) plus 'back' (bæc), the literal back of the literal animal. English has long loved this kind of stacking — 'horseback,' 'shoulder blade,' 'fingertip' — naming a part by simply bolting two everyday words together. The word does exactly what it says, which is rare and refreshing.
original cavalryMongol riders conquered more land than anyone in history
core strengthRiding works abs harder than the horse's legs
trust fallYou steer a half-ton animal with your hips
ancient flexStirrups arrived late, around 300 AD China
reading mindsHorses sense your heartbeat and mirror your nerves