
That's what I grew up with and I was at a barn that had little else, so I really didn't know about the rest of the horse world until I was an adult. In my 20s, I had a barn that I leased to a hunter/jumper trainer and I started seeing things that just boggled my mind. They would get in these sale horses that they had NO history on, that for all they knew had been sitting in a field (horses from the local dealer that he had just picked up at various auctions), and they would literally jump on them and work them into a white foam and try them over fences the first day. OMG. I couldn't believe it. It was obvious to me from looking at the horses that they weren't fit enough to do any of that. No one cared. Of course they had lots of vet bills and horses would have these injuries and need stall rest and surgeries and all kinds of crap. I couldn't believe the amount of money wasted.

And there is such a range of knowledge and belief on this topic. In the h/j or dressage worlds, it's not unusual to find people who believe that it's better to canter an unfit horse at first in a half seat position until he's a bit more muscled, stretched out and used to cantering again before you plop your butt down on his back. In other disciplines, no one does this or even thinks about it. (I never used to do it, either. I always do it now with anything that has soundness/back issues or is coming back from a layoff of unknown time, like a rescue. As with many things in horses, I thought about it and it made sense, so I do it.)
Some of the things I've learned over the years (and you may discuss at random whether or not you think I'm misinformed or what your experience is) include:
1. Don't work an unfit horse hard on a small circle, like in the round pen or longe line. Much better to ride in a large arena or field, with fewer turns. Establish a level of fitness before you ask for small circles/sharp turns/rollbacks.
2. While conditioning should start on level ground, trotting uphill is a great exercise that builds muscle and really helps horses with chronic issues like a weak stifle. Don't trot downhill - way too hard on the forelegs. I don't care what they do in the John Wayne movies!
3. There is no such thing as "too fit" and it does not increase bad behavior; however, there is no need to run a horse into the ground, either. 30 minutes of actual continuous work (i.e. not just walking) is about the most I ever ask a horse to do, regardless of how fit or young they may be. Walking for long periods with little trot or canter breaks, like on a trail ride, is different but should not be mistaken for not being work or being "easy" for the horse. It's easy for a fit horse - it can be hard work for an unfit horse even if you never break out of the walk, and they absolutely can injure themselves just walking.
4. Deep footing is the devil if you have tendon problems to deal with. Try to ride in an arena that is not deep, or on grass, particularly when fitting up a horse with a history of tendon problems. Like jogging in sand, deep footing makes for hard work, so if the only arena you have to use has deep footing, take that into account and increase the workload more gradually.
5. Interval training works for horses, too. Short gallops, followed by a return to a normal working canter, build wind and endurance.
6. If you're a 125 lb girl fitting up a horse for a 225 lb boss, recognize that the horse has to be twice as fit for you to be able to hold up to the added weight with him. Trot, trot, trot and build muscle to help the horse cope.
7. I honestly don't know if this is an old wives' tale or not but I always was taught that white foamy sweat is a sign of an unfit horse. A fit horse's sweat runs clear. (Excepting the between-the-butt-cheeks foam or the right under the edge of the saddle blanket foam that is friction related) OK, vets and vet techs, any truth to this?
8. Warm-up and cool-down properly. You'll never regret taking 15 minutes to walk at the beginning of a ride, on a loose rein. You will see that you have so many fewer leg problems. Same thing goes for cool-down. I used to ride where the horses played Sunday AM polo and then the barn was closed Mondays, so they would sit in box stalls until Tuesday night after work (the barn did not turn out for you). I started to walk them out for 20 minutes on Sunday afternoons and I think it was a huge, contributing factor in having pretty much a zero lameness rate - even with older horses with some chronic issues. If you can bring them home from a show or event or long trail ride and turn them out instead of putting them in stalls, I guarantee you'll have fewer lameness issues. They need to walk after they exert themselves - don't think it's better for them to lie in shavings and rest just because you're excited about heading for the couch and the Tivo at the end of the day!

All right, everybody, what do you think? Are you as horrified as the ignorance of proper conditioning in the horse world as I am? What is your regimen for bringing a horse back from a long layoff? What are your tips for fitting up a horse with soundness issues or back issues? Do you use protective boots/wraps or do you believe that horses get too dependent on them? (I do like the SMZ boots. Been using them for years, and no, I don't think horses get too dependent on them, though I save them for the conditioning period, and then only thereafter for strenuous activity or when footing is iffy) How many of you use relatively high-tech methods of conditioning, like aquacizers and treadmills, or do you do things the old fashioned way?
I'm also curious, for those of you in lessons with a trainer, what has your trainer taught you about conditioning? If you are a trainer, what do you teach your students?