Free Body Diagrams
Since both W and N are applied to you by the Earth,
we can use Newton's Third Law to draw a
Free Body Diagram for the Earth showing only
the forces applied to it by you.
These forces are pretty feeble compared to many other forces
acting on the Earth, such as the Sun's gravitational attraction,
so we will not obtain any useful information about
the Earth's acceleration (for instance) from this diagram.
Nevertheless, we can draw it.
Here -W is your upward gravitational pull on the Earth
and -N is the downward push of your feet on the ground.
