One step is only 0.4m, which is sheer nonsense. Generally speaking, a step is between 0.65-0.85 meters, the short step is smaller and the high platform step is larger. There is a "health" function in Apple's mobile phone, which records the number of steps and corresponding kilometers that an individual takes with his mobile phone in a day. This can be used as a reference. Twenty thousand steps is almost 15km. However, according to my personal experience, if walking is not enough, you must jog for 40 minutes to an hour every day. It is best to run after meals, and it is no problem to lose 10 to 15 kg a month.