"Actually its the whole side that turns in an unbroken line"
As this is the only part of your post that is actually a coherent and comprehensible sentance, it is the only part I will address - to point out that it's wrong.
In reality, essentially all ballroom rotations occur not as a rigid-body action, but instead as a sequence of actions where each part of the body turns at its own appropriate time - some of them obviously turning together, but not necessarily with the most adjacent body part.
This is very much like the head spotting action that many are familiar with, only applied in various ways to outher parts of the body. The reason for this is that the constraints governing when a body part can rotate are different for each part of the body. Some need to rotate in order to permit moving past the partner, some need to stay oriented towards the direction of movement, and some stay with the partner. Even things many are told are absolutely fixed like upper arms to shoulders, are in the ultimate reality not. But you won't get into that until you have been dancing at a high level for a number of years - it would just confuse a beginner.