Take a simple long stick and swing it without stop. Start walking and make the stick move following your steps and check if this works for you.
The wave or whip starts with the breath in the body and moves either to the target or to the limbs or tool and than to the target. The body usually moves slower than the limbs so it is like the handle of a whip or a sword. You can use this difference in movement to change a movement that is already underway. It is good to be able to not complete a move and be less readable and controllable. For example if you are lifting something heavy like a 5K hammer to break a plaster wall and notice a person on the other side after the swing is already strong you may not be able to stop the hammer but you can move the body which is more free and do less harm. If you are carrying a person in your hands and your leg is caught in a branch or wire and you fall forward you can still turn your body to protect the injured with your body.