Reflections on Off-sensation

I notice, as I meditate, certain pressure on me that appears to increase until at some point where it is no more.

Sometimes, when I am on the bed or sitting somewhere, I still, make no moves, soon it is as if this body is not mine. I sense nothing. A variation of this is, I think, what the author calls off-sensation.
You can practice this outside meditation too .

You may also combine the stillness with single point meditation, to empty yourself from pressures that cause trouble for you.

Let as assume nafs or ego is some sort of pressure, as the author suggests, let us also assume it goes where attention goes, as old Chinese observations attests. If so, where we focus matters because if we focus at top part of our body, the pressure of our psyche or ego would contribute to physical and mental instabilities, as opposed to when we place such pressure on our lower belly, where it shall contribute to mental and physical stabilities.

People who move a lot, like nomadic people, will always focus on lower belly because their muscles are active, as opposed to sedentary people, people who spend a lot of time sitting.

If so, It will not be difficult to imagine who will be more stable?