Every time I hear about actors and Westerns I think about the great Jack Palance and the events around his scary character in Shane: (basically he could barely ride and the ways they got around it)

https://legendsrevealed.com/entertainment/2013/12/30/was-a-scene-in-shane-of-jack-palance-mounting-a-horse-actually-just-a-rewound-shot-of-palance-dismounting-the-horse/