This problem has been explained by Beijing Ningning Pole Dance Fitness Training Studio in official website, because 40mm galvanized steel pipes are used in China. Generally speaking, boys have the experience of climbing trees when they were young. Rough bark and thick trees are not easy to climb. Compared with 40mm galvanized steel pipe, it is hard to imagine. In addition, girls' natural grip strength is worse than that of boys, so in order to complete a perfect movement or a group of movements, they can only rely on the close contact between skin and steel pipe to increase friction. In addition, sports bra's clothing highlights the dancer's wonderful posture and shows her strength and beauty more intuitively!