I have a 21 year old pony. What stretches should I do to avoid him from getting sore and stiff?

Carrot stretches are greya
Simple leg and neck stretches are great for the older horses and ponies, simply bring their legs forward and back as far as they'll go comfortably and bring the neck to either side as a stretch as well as down to the ground and up over ear height. Hope this helps!
I think the best you can do his walk him every day 🙂 Another suggestion is walking I'm backwards, even on younger horses, it realigns they're skeleton and its good for them!
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