Gravity !
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The law that explains this interaction is Newton's third law of motion, which states that for every action, there is an equal and opposite reaction. When you walk, your feet exert a force on the ground in the backward direction, and in response, the ground exerts an equal and opposite force on your feet in the forward direction. This interaction allows you to move forward by pushing against the ground.
Lift
In mechanics, the force exerted upwards by the surface that a body sits on is equal and opposite to the force exerted downwards by that body and is referred to as the Ground Reaction Force (GRF) or simply Reaction.
about 6.5 milinewtons
Welll...... when you jump... you leave the ground... when you walk.... you dont.... unless your klumsy.... or if youre jump walking....