The body is obviously the part that moves and does. It's the visible part.
The soul is the part that gives life to the body - it tells the hand to lift, the foot to step. It's our personality and our inner self.
The spirit is the part God uses to reach us/commune with us.
I wander back and forth being thinking all humans are born with a spirit but it is dead until we are born again or if it is always alive and some ignore the urgings of the Holy Spirit.
And by now, I'm sure I've completely confused you...