system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why don't manufacturers of medical walkers redesign them so that people don't have to put tennis balls on the rear legs?
gpt
The legs are designed to have a lot of friction. Some of the elderly don't like this because it's loud, hard to slide across the floor, leaves marks, etc. But at the end of the day they're sabotaging a safety feature.