inside, and a lot more, it is bound to cause the height of the machine body is too high, people lift foot when tread is very convenient.
in use, the needs of the foot in the foot, and then a one-time kick in place, so that the general product can go smoothly. if the tread of the people is not very balanced, the four corners of the shoe set will be lost only by the angle of force, the angle of stress will not be lost, causing the foot of the shoe to be wrapped in shoes and automatic shoes. live, can not take the foot of the dangerous situation of 