Does the subject want to ask, "What is the reason why the stair climbing fitness equipment is fast and slow?" There is something wrong with the drum. Climbing stairs is an excellent fitness equipment. When using this machine to exercise, you need to check whether there is anything wrong with the roller under the running belt. If there is a problem, you need to find a professional to repair it before you can use it normally. Fitness equipment is a kind of equipment that can help us to exercise easily.