Are these mats easy on knees? Tough but soft? Setting up a gym at home. Are they hard enough to set gym equipment on and soft enough to run a cardio workout session without killing joints and knees?

Our 3/8" Heavy Duty Rubber Rolls are not the easiest flooring on the knees. If you want something that will be easy on the joints and durable enough for fitness equipment, we would recommend using our Impact Rubber Rolls or our black Regrind Rolls. These floors are less dense than our mainline rubber rolls like the 3/8" Heavy Duty Rubber Rolls.