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There is a lot if debate about how much riders should weigh to ride different types of horses and this is something I have touched upon before, especially in regards to showing and new rules being put in place.
Suitable Rider Weight
There are certain times when I would want a lighter rider on a horse. When a young horse is starting it’s ridden career, it will probably have very little top line to support a rider, plus the growth plates in their spine will still be open. Therefore I would want a lighter rider than a mature horse. Older horses also start to loose muscle and would probably benefit from having a lighter rider.