motion is relative to the observer: to a man falling off a building, his perspective is still motionless - the ground from his perpective is accelerating towards him - flying on an airplane from the passengers perspective is motionless - everything else is moving outside of the airplane...everything is moving relatively to everything else - there is no "fixed reference" that is stationary and not moving

The only time you can "feel" motion is an acceleration causing a force to be applied. Gravity is an apparent force - its not a "pull", it is space curved by mass. Your body is trying to continue in a straight line (in curved space) - like everything else in the universe - but the ground is in the way - accelerating you upwards.

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