HW, those mats made from old rubber tires are excellent to stand on at the lathe, mill, drill press and Anvil, really makes a difference at the end of the day for me.
In the shop I have a bunch of old door opener mats with ribs that I use, they were free from my neighboring business who installed them and replaced faulty ones years ago, I just cut the wires off short, they have an air cushion so that when you step on them they make contact.