HHmmmm, I don't know the answer but I hope that chilled out horses can be good competition horses as I've just bought a chilled out ISh who I hope to compete having had a TB competition machine before!
I suppose it will depend on whether the horse knows and likes his job?
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my daughters horse is really lazy, but that didn't stop him doing really well internationally. its great to have a horse who is sensible, laid back and willing but not fizzy, stupid, etc. by the way he's an american quarter horse who are known for their good manners.
If you are trialing a horse don't always judge them by their home behavoir.
I used to do enducances on an Arab that to train was a xxxxx sea-side donkey (imagine having to kick and push along for 15-25km training 4-6 times a week...)
But on the day it was all I could do to stop him, and he would tug my arms out for the full 40+ kms....=)
God I had some fun with him though!
Also I would prefer to jump a forward going horse as they inspire more confidance (in me) in the probability of them taking off, rather than a las minute sliding halt.
But that is just my experience.
The idlest horse I've ever ridden is at our yard. He does VERY well though as he's got a massive jump and is very careful. Bit of a chore to get him going for the jump off though!
There is a different between forward thinking and forward going IMO. A forward going horse can still be behind the leg, therefore not making an easy competition horse in terms of control. Now you can have a horse that isnt naturally fast but if they are forward thinking, have the right temperament and natural ability they can make a fab competition horse.
They do say though that the horses at the top are on the pint of insanity though, dont they????
personally i find forward going horses easier to compete than lazy horses but they also seem to have a bit more of a 'can do' attitude than more laid back types and are more quick thinking on the xc
some top horses are laid back and quiet but i think the majority are quite highly strung and are not the type of horse you would find at a typical livery yard.