Encumbrance of a horse

[fredtheobviouspseudonym]

Originally Posted by Bruno

I've ridden a misbegotten quarter horse-Clydesdale crossbreed. It's a lot like sitting on a very hard bicycle seat on an old bike with little or no suspension and hard tires, and driving over the worst potholes ever. It HURTS.

IIRC skeletal studies of people from old riding societies (Scythian, Mongol, etc.) show almost universal evidence of lower back problems.