Yoga mats are specially fabricated mats used as an aid during the practice of hatha yoga to prevent hands and feet slipping during asana practice. They are also commonly known as non-slip mats or non-skid mats. With yoga's introduction in the West, many practitioners used towels or cotton mats on wooden floors. Slipping of hands and feet was avoided by squirting a mist of water on the mats on the respective places of positions. If you practice yoga on the grass, sand, or even on a mat, it is important to know that standing postures require strength along with flexibility. Whether it's indoor on a wooden floor, or a mosaic or marble floor, the body is subject to muscle cramps and fatigues if it gets slipped in undesired directions during practice of yoga.