Since the beginning of our time with horses, horse owners have used training horses within a confined space without corners. Stakes in the ground with tree branches as sides work but have some dangers.
Vertical walls on a round pen work, but angled walls help keep the horse away from the wall to give riders more room above their lower legs. If using boards, be sure they are attached to the inside of the posts to provide a smooth surface. Inspect all walls for loose nails, chipped or loose boards, or other issues that could injure your horses.
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