Female sumo wrestler Sayaka Matsuo (L) fights with her teammate Shiori Kanehira (R) during a training session at Nihon University's sumo club in Tokyo, in a photograph taken on January 25, 2015. Nineteen-year-old Sayaka Matsuo lies on the tatami mat as a personal masseur works on her neck and shoulders to squeeze out the knots. But this is no pamper package with relaxing music or detoxifying mist. Matsuo is warming up for a head-clashing bout of Japan's national sport - sumo. [Photo/CFP]