Roller skating lessons in private kindergartens are extra. According to the public information of relevant materials, providing roller skating courses requires additional resources and equipment investment, such as purchasing roller skating equipment and renting venues. These expenses need to be covered by fees. Roller skating courses may need professional coaches and counselors to guide them, and their wages and training expenses also need to be covered by fees. Kindergarten may think that roller skating course is a high value-added course, which can improve the teaching quality and competitiveness of kindergarten, so it can increase income through extra charges.