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 :
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Rubber Flooring Rolls - Rubber Flooring Direct
Rubber Flooring Rolls - Rubber Flooring Direct
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Amazon.com: SPRI Hanging Exercise Mat, Fitness & Yoga Mat for Group Fitness Classes, Commercial Grade Quality with Reinforced Holes, 56" L x 23" W x 3/8" Thick : spri: Clothing, Shoes &
How To Clean Your Rubber Gym Tiles | BLK BOX Flooring
Amazon.com: ProsourceFit Rubber Top Exercise Puzzle Mat ½-inch, 24 SQFT, 6 Tiles, EVA Foam Interlocking Tiles for Home Gym Protective Flooring for Equipment and Workouts, Blue : Sports & Outdoors
NEXT 24ft Gym Flooring Exercise Mats Black N2001 - Best Buy
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The Floor is Yours: Let's Talk About Gym Flooring | REP Fitness
Home Gym Floor Mats - Exercise Room Flooring
Rubber-Cal Diamond Plate 4 ft. x 10 ft. Black Rubber Flooring (40 sq. ft.) 03-206-W100-10 - The Home Depot