2. Beef tendon meat is rich in protein, low in calories and rich in cellulose and vitamins. After intake, it can help the body's muscle fibers to thicken, which can assist in fitness. Moreover, it can accelerate the discharge of waste in the body, and will not consume too many calories, causing fat accumulation, so it will not have side effects on fitness. However, it should be noted that beef tendon is tough, and excessive chewing may cause gum swelling and pain.