The specific reasons for frequent leg weakness are as follows:1. Considering that too much exercise causes rhabdomyolysis, or causes a large amount of lactic acid to accumulate in the calf area and thigh area, which results in soreness and weakness of the legs.2. Considering that it is caused by water-electrolyte disorders, for example, weakness of the limbs occurs when there is low potassium, especially due to the poor nutritional status, as well as insufficient intake of long-term potassium-containing foods, which all lead to a Prolonged low blood potassium state, so there will be weakness around the body, leg weakness. 3, from the perspective of traditional Chinese medicine, leg weakness belongs to kidney deficiency, which is a deficiency evidence, and both qi and blood deficiency will lead to the symptoms of aching legs and weakness.