Movements is good thing however movement for the sake of movement is not.
Movement should be used to gain a position of advantage ie: get off the line of attack, get to cover and/or to close in. In short, you want make it hard for the enemy to hit you and to end up in a place where the enemy cannot shoot you and you can shoot them if they are not neutralized during the time you are moving.
One has to be well balanced and a lot of things have to work in concert to be successful with self defense.
People do not have to consciously think about walking down a hall way or even pointing their finger. The conscience mind starts the procedure and the sub-conscience mind takes over and does many tasks simultaneously as you walk or raise your finger to point at something. Techniques need to come as second nature and done without conscience thought throughout the task.
The circumstances and the surrounding environment will dictate which technique a shooter will employ. This information is taken into by the mind and the mind makes these decisions in a split second. This environmental/target information should be processed as the shooter walks down the street. One needs to be aware of their surroundings to start their plan of action. Those of us the have spent extended time in hostile zones do this without thinking about it. The plan is constantly being put together as I walk down the street and while Im looking for threats this is where the term gut feeling comes from and treat everyone with respect but always have a plan to kill everyone comes from. Your gut feeling is your sub-conscience mind picking up on something your conscience mind has not processed. This then kicks in your plan action you should already put together in your mind. Those who do not have a plan of action either panic or freeze.
This gets us to dealing with the threat and distance is the main factor along with action versus reaction usually dictates the response. We must always remember that distance buys time and time and distance buys options. This is the reason why threat identification is so important along with having a plan of action is so important. In most cases there is only one or two right choices to deal with the situation.
In extreme close quarters battles, a person commonly has two options, they must get the gun off their centerline with H2H techniques or move their body off line of the weapon and/or both. Then comes the decision to continue with H2H or go guns. Which is right or wrong depends on several factors such as the size and number of your opponents.
As the distance increases, moving off line is the way to go. In reactionary situations outside of gun grab ranges movement is necessary and used to get off the line of attack and to buy you time to get your gun in operation. Outside of gun grab and H2H range, I teach moving left or right at 45 degree angle forward because of the speed one can get off line and the difficulty your opponent has with tracking you.
The only thing I stress is the path you take is not set in stone and you can change your path/direction at any point you choose. I also teach a parallel route in from the flanks and I want to pass next to my opponent and end up behind him. I have found that rushing straight in does has its own set of drawbacks. However, with that said, a majority of people will become locked on the target and will move straight at the target in the heat of the moment. For those that dont moving in parallel track increases the difficulty of your opponents shot.
Dynamic movement is not running or sprinting. It is faster then walking but slightly slower then running. Dynamic movement is done with a lower base and larger steps are used to decrease upper body from bouncing.