rubber tiles will work best for you situation.the very simple reason being, that rubber tiles are soft and a bit of shock absorber, which you will need a lot as you have a gym, and they are very skid free ( very very important, you dont want a 100 lbs weight falling on a guy who skid.)
Mahjong is a game for four players that originated in China. Mahjong involves skill, strategy, and calculation, as well as a certain degree of chance. Depending on the variation which is played, luck can be anything from a minor to a dominant factor in success.
