There are many causes of calf muscle flaccidity, such as severe protein deficiency. If there is not enough protein, it will cause the muscles to be flabby and inelastic, and the loss of muscle support is the most important cause of muscle flaccidity. Aging of the body, weight loss, uneven nutrition and lack of exercise can cause muscle laxity. Other causes such as heredity, stress, exposure to sunlight and smoking can also transform the structure of the muscle, losing elasticity and causing relaxation. In addition, muscle cell atrophy is another cause of muscle relaxation. Appropriate physical exercise should be carried out in daily life to enhance muscle contraction and maintain muscle tone to prevent relaxation. Collagen can also be supplemented, either by injection, orally or through other means, allowing the muscles’ ability to be significantly enhanced. Diet should also be balanced, should eat more high protein, high vitamin food, avoid eating high fat food, so as not to produce free muscle, accelerate muscle aging caused by flaccidity.