Ra on creating your own reality.

[anagogy]

Does it take a lot of magnetic force to hold the spirit in the physical body during incarnation?

Oh, you said we're not really in a body.

Is my primary focus magnetically attached to us just as our body?

Those were the best words I had to describe it in the moment, but it was less than literal.

Your higher self tends to "where" your focus is "anchored".  When you agree to an incarnation, it maintains your physical body as the "contractual primary focus" for the duration of your incarnation.  When the agreed upon time is expired, that anchor is removed. I would have no way of quantifying the force that keeps you anchored, so I won't try.

And when I say you are "not really in a body", I was pointing to how "location" is all perceptual, an illusion created by the senses.  It is, however, very convincing.  And even when you astral project and it feels like you "left your body", it remains a convincing perceptual illusion.  And if you get too close to your physical body during an astral projection (10 - 15 feet), it will tend to suck you back in (again, that is how it feels, not how it is).  Some astral projectors call it the "cord activity range".  It feels very magnetic in nature.