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How to lunge a horse
Find an enclosed space for lunging, preferably a ring or small enclosed pasture.
Be sure that the footing is safe for your horse throughout the ring and that you can make a circle that is at least twenty meters in diameter. Do not work the horse on a tight circle for an extended period of time, as it can cause damage to their legs.
Avoid bringing your horse to these places only for lunging, spend time doing activities to desensitize the horse to the new location. Apply polo wraps or brushing boots to the horse before starting work.