10-07-2010, 08:53 PM
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You should not be "running" a horse at all on a lunge line. Cantering is very hard on the horse's joints. You should be doing trotting and walking mostly, with just short bouts of canter, like 2-3 laps once or twice each direction. It is very helpful to teach a horse to walk on a lunge line as well.
To minimize stress on the horse's joints, I limit lunge work to 10 minutes each direction, so 20 minutes total. Working the horse in side reins will help build the proper muscles. If you've never used side reins, enlist the help of a trainer or more knowledgable horse friend. Done wrong or too tight, and you can end up with a train wreck...