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Like one of those things that people work under vehicles with? https://www.harborfreight.com/300-lb-capacity-low-profile-creeper-gray-63371.html
They have wheels, but it kinda fits your description.
I was in the middle of replying how that would be perfect “if only it were more narrow like a balance beam.” Looked up floor balance beams and they exist. Thanks for the assist.
