This is a cautionary tale, after I met a show-jumper a few years ago who was giving up riding completely due to a horrid accident.
She’d been jumping at home, in an arena with smart new post and rail fencing (like that in the picture), had just completed an exercise well, and was cantering a circle to finish.
She went very close to the fence and had her feet sticking out with her heels down. Her foot caught one of the uprights and her ankle was smashed completely as the horse cantered on.
So, when riding in arenas with post and rail fencing, don’t go too close to the boards, and remember to keep your toes in… it’s not just about aesthetics, it’s also about safety!