What supplies the input of force for you to move your bones?
The force that moves your bones comes from your muscles.
The energy that your muscles use to produce the force and move
it
through a distance comes from the food you eat.
The energy that your brain uses to generate an electric current
that
flows through your nerves to your muscles and causes your
muscles
to contract and pull on a bone in order to move it also comes
from
the food you eat.