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I use anti-fatigue mats. They are available at Menard's or Harbor Freight. Light, waterproof and effective. 20% off coupon at HF's web site.https://www.harborfreight.com/4-piece-anti-fatigue-foam-mat-set-94635.html
Good ideas above. Question: how do they dry out? I use 12 X 12 inch carpet squares. They get soaked during the day. I put over heater vent at night and they are dry by morning.