Certainly they do, ie if you don't compensate with exercise your spine will be in pretty bad shape and I would expect damage to be distinguishable from diseases

Certainly they do, ie if you don't compensate with exercise your spine will be in pretty bad shape and I would expect damage to be distinguishable from diseases like scoliosis. I mean pro tennis players get their swinging arm elongated by up to 1cm, so I would expect frequent horse riding leaves marks on pelvis, joints and maybe spine that no other activity does due to specific position and pressures applied.