Go to the AERC site; they have TONS of articles and (as I recall) several on conditioning a young horse.
For the next year or so you are going to do mostly LSD (and not the fun kind either!;)) – Long Slow Distance. So lots of walk and some trot. Not alot of hills, although I would think WALKING up hills would be great.
Others with more experience can freely correct me, but I would think doing trail work 3x a week is plenty, with maybe 2 days of arena and 2 days off.
Gradually you can start to increase, but just like with people & exercise, you only increase one aspect at a time.
In other words, never increase speed and distance together. Instead, maybe ask the horse to go abit faster over the same distance as always, or ask them to go farther, but at the same speed as before. Factor in HR – you can ask them to work harder, but in a short time frame, but not work harder AND increase the distance at the same time.
Lots of people use HR monitors these days, but I’m surprised at how many really good, successful endurance riders DON’T use them.
When I asked one gal if she uses one (and she routinely puts 1000-2000 miles on her horse PER YEAR), she said no…she just pays close attention to her horse. But then, she’s been doing this quite afew years and she knows her horse REALLY well.
This is stuff I’ve just picked up from reading various endurance books and talking to friends of mine who have done well in the sport. Also this board and the “official” board of AERC “Ridecamp”.
And I’m sure Denmark has something like both of those forums/BBs/chat rooms.
I would assume you also have to prepare the horse mentally for the sport – stuff like riding alone, vet checks, the “hustle & bustle” of a ride, eat/drinking on the trail, etc. That would just make sense.
As far as EXACT distances, times, days worked, etc. I’ll let other, more experienced folks take over on these subjects.
I have noticed from the reading I’ve done is that there is a pretty wide variation of opinions on this…I seem to remember reading 2 different articles on the AERC site that were quite different in their approach to conditioning.
Can’t wait to see what others have to say…the ideas expressed here are pretty much based on my experience training race horses, but just expanding certain elements…