"Energy enables physical work to be done"
What does this mean? It means that energy is a property a body has that helps it move against a force.
Physical work is done when something moves against a force. This needs a transfer of energy to take place.
e.g. work is done when we lift an object from a table onto a shelf. We are lifting the weight (a force) upwards.
In this case energy is transfered from our arm to the object.