3 Reasons Why Isometrics, The Way We Teach It, Is Ideal For Speed Training! The training does not mix endurance or strength training with speed training, so it can focus soley on the factors that make it a pure speed training program. First, what is meant by muscle contraction speed? Use the biceps muscle in your arm for an example. When your arm is stretched out straight, your biceps muscle is stretched. Now move your fist towards your shoulder. What has happened? Your biceps muscle contracts thus moving your fist toward your shoulder. Obviously, the faster your muscle contracts, the… read more