It is the product of other energy.
You don't just move because you want to move. You produce chemicals, which produce chemical energy, which fuel nerve impulses, which cause reactions in your limbs, which produce movement.
“…Judge not what a man has done, but judge what he could have done if he was a different bloke altogether. For art thou a leper? And a leper can changeth his spots…” --Rudy Wade, Misfits (Series 4, Episode 8)