Good: Regupol: Regupol Aktiv Flooring is engineered from recycled tires to create a material that is extremely dense, resilient and wear resistant. It's also manufactured in the USA and available in a wide variety of colors and designs.
Better: Rogue Gym Mats: Sold in 25 sheets of ultra-durable 4'x6'x3/4" rubber matting, weighing 100LBS each. Rogue Gym Mats are matte black with a diamond shape pattern. The length, width, and weight of each mat is approximate and some sheets may not match up perfectly.
Best: Plae Achieve 18 MM: Available in 25 foot rolls with an 18mm depth, Plae Achieve flooring is made from recycled SBR rubber tires and EPDM rubber granules bound with polyurethane. The resulting surface is smooth, seamless, grip-friendly, and easy to maintain.