Join Date: Jun 2012
Location: Melbourne, Australia
I can see three problems with cantering on the lunge, over trotting (won't go into the benefits and drawbacks of lungeing here - will derail this thread lol). Firstly, it's faster, so the turn has the 'feel' of being tighter for the horse, and an unbalanced horse (in particular) will lean to the inside, placing more stress on the inside leg joints. Secondly, the nature of the canter as a gait means that for much of the stride, only one leg is supporting the weight of the horse. This puts a lot of strain on both the joints and the tendons in that leg.
I think if you're going to lunge a horse, do it for submission purposes - keep it short (5-10 mins) with focus on transitions and direction changes. That's my thought anyway.