from the metaphysical dictionary for the literalist

grounded: a state of awareness of one's relationship to gravity and the earth. corporeal awareness in the present moment. a person is not distracted or disassociated from their current location. they feel their feet, their skin, their clothing, see the world around them, sense the air moving in and out of their lungs.

flying: the ability to work into gravity to lift one's self off the earth. usually as a result of creative or atheletic activity or both. a feeling of being 'high' while still corporeally aware. in contact improv it is the moment when one is completely off the ground, suspended on someone else's back or shoulders. to be safe while flying requires a clear relationship with the gravitational vectors and with lift.