I've been thinking of getting some practice mats for home use. In my area the martial arts shops sell rubber jigsaw mats, about 20mm to 30 mm thick, and about 1 metre square. I've never trained on these before, but they seem like a hard landing to me. My dojo uses gym mats, about 50 mm thick. This might be a preferable option, though more expensive. If I go this way, I'm thinking of two mats 2 metre by 1 metre (roughly 6 foot by 3 foot). Its not a huge area, but I can lay them end to end for practicing rolls, and side by side for everything else. Any thoughts? Is a two by two metre square configuration appropriate? What size and configuration would others recommend.? What thickness, and what materials should it be made of? The ads I have bandy about options like foam and/or compressed rubberised foam, and I have no idea what the difference is in terms of landing on it. Any suggestions or tips gratefully received.