If the tendons and ligaments are too weak to support the pressure, the muscles can cause a complete tendon blow (pop). However, tendons can be strengthened with many methods. When tendons are in pain, they require blood so they can heal faster. Doctors and arm wrestlers recommend doing rehabilitation training or therapy, exercising with light weights and many repetitions for 30 - 45 minutes non-stop to pump the blood into arms. Tendons can get bigger with time, though it is a very slow process. Experienced arm wrestlers can have tendons 3 to 4 times bigger than average people.