The shoulder: This is the only point in the whole process that doesn't change it's position. So you must not move your body when throwing. The only throwing action comes from your arm.

The elbow: It stays in position when moving the dart backward and forwards, and on some point in the acceleration phase, begins to rise. This is a very interesting occurrence, because you may have heard the advice that the elbow should also stay fixed during the throw. This is actually wrong! Again consider the previous diagram. A fixed elbow would force you to release the dart earlier. This is like the difference in accuracy between a rifle and a pistol. The rifle's longer barrel increases accuracy as it provides guidance of the bullet, and as we have to keep the dart on course too, the elbow must be raised in the later phase of throwing. Also, note that the hand still follows the way of the dart after it has been released. This makes the release much easier because we don't have to find an absolutely exact release point. It doesn't matter much if you drag it out a bit, the dart will stay in a nice flying position anyway.

The wrist: Wrist action is an often-discussed subject. Most pro players use 'wrist snap' because of one reason: it helps in acceleration. Let's consider the 3-lever system as a whip. If you do wrist snap, then the tip of our whip (i.e. the dart) will go faster, and therefore you will be able to move the other parts of the lever system slower. Doing so will put less force in your throw, and this will improve accuracy. But there is one danger in wrist snap: It's one more thing that must be controlled by the thrower and thus provides another source of error. While most experts and pros use it, it is not recommend to beginners that don't yet have the ability to control it.