Here at work we have a workout room with some mondo tough flooring. The instructor in charge of the area says that is is vulcanized rubber. The flooring has been in place over concrete for 6-7 years at this point, and has heavy Nautilus equipment and even some free weights, and the floor still looks great. No visible wear or damage that I can see. It's just enough cushion to avoid leg fatigue but not so much give that the equipment sinks in.

I have several of the anti-fatigue mats scattered around where I work most, but I would love the have the whole shop like that.

Has anyone done this in their shop? What did you use and how do you like it?

TIA,
Charles