Young children in a gymnastics gym are prone to walking into cables and chains supporting bars and rings.
Cables really are a hazard.
The most popular way to protect people is to cover those cables with a pool noodle. The more brightly coloured and obvious, the better.
An alternative used by coach Shane Russell at Taiso worked surprising well. Rather than have to replace the pool noodles every few months (as they disintegrate), Shane threaded the chains through plastic pipe. Far more durable, but not as soft as the pool noodle.
Whatever you use, access to the turnbuckles and adjusters is essential.
Gymnastics Coaching.com 