Lifting structure for platform of treadmill

A lifting structure for a platform of a treadmill, comprising lifting units rotatably connected to a treadmill support, the lifting units having a first position for lifting a front end of the treadmill support and a second position for making a lower edge of each of the lifting units higher than support surfaces of support legs and/or support wheels of the treadmill;

• wherein the lifting units are configured to be adjusted to the first position to provide climbing exercise, and be adjusted to the second position to provide flat running training;
• wherein each of the lifting units comprises a slot for containing a side connecting rod of the treadmill support;
• wherein each of the lifting units comprises a first wall and two second walls arranged on two sides of the first wall, and the slot is formed between the two second walls, and configured for containing the side connecting rod of the treadmill support;
• wherein upper portions of front ends of the second walls are directly fitted at a position above a middle part of the side connecting rod of the treadmill support by means of a fastener or a pin;
• wherein a front end of each of the lifting units comprises avoidance space for avoiding the side connecting rod when the lifting units are in the first position, and a certain distance is left between the front end of the first wall and the front ends of the second walls to form the avoidance space.