I have heard a few horror stories over the years of horses standing on a pole which rolled (of course) causing injury. In one case it was the end of a good jumping mare’s career.
So now I always use planks or plastic rectangular ‘poles’ instead, which, if the horse stands on them, will not roll. It’s a rare occurrence, but as this picture shows, it does happen – this was sand from a hoof put squarely on the plank. Not a mistake my horse made again during that session, she didn’t appreciate the feel of it under her foot at all, but no damage done, which is the most important thing.

Can you please tell me where can I purchase these yellow plastic planks from?
Hi Amy,
The plank in the picture is a home-made wooden one which I painted. The plastic rectangular ones I have are all white and came from Jump 4 Joy, these ones: http://www.showjumps.com/4-Accessories/614-Trotting_Poles.html
Mine are years old and totally indestructable so far!