What is work ? If science is to be trusted, when one tries to modify the universe in a physical way, Work is the amount of energy effectively resulting in the modification. That is typically way lower than the total amount of energy expended to produce the modification. If you're not a physicist, you might need an example : My bike is parked down the hill, I want to move it up the hill, I'm going to spend energy getting there, getting on the bike, riding it from A to B, dropping it, and going back to where I was to begin with. Write off the energy spent while not on the bike, then write off the energy lost in the chain, the ball bearings, the tyre compression, the air friction. Then write off the energy wasted moving my own weight, what's left is the work. The exact minimal amount of energy needed to get all 15 kilos of my bike from altitude 150m to altitude 165m.
Taking the bike up the hill is a very inefficient business.