Costco (in Canada at least) has these sweet rubber mats that remind me of the gym. Way cheaper than Amazon since they are heavy as heck! It's flat on the other side :
Ultralock Black Solid Garage Tiles | Costco
WeatherTech Universal All-weather Car Mat 4-Piece Set | Costco
Coverguard 3' x 15' XL Garage Floor Rubber Mat | Costco
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