Relaxation happens as a side effect
Every session has a different aim. An aim is not a destination but a direction the treatment takes to move towards. It is flexible at all times. It depends on how you are feeling at the time, if there are any specific issues such as tension areas or pain or the wish to improve range of motion or to optimise performance in a specific sport, or to improve your balance, or whatever it is that you would like to work towards.
Relaxation happens as a result of a better organisation of the system. It is the perception of a better integrated whole where the parts are moving in relation to each other. You feel looser and softer and more connected because your nervous system has remembered that it doesnt need to make so much effort!