I make energy (a word describing the measure of the invisible magic which makes sea waves happen, the sensation of warmth of the sun on your skin, and the effort you put into lifting heavy rocks) move around really, really, really fast, and lots and lots of it too.
Controlling this 'energy' is a difficult task because if you give it even a little chance, 'energy' will escape in the easiest, most useless way possible. Half my job is planning how to prevent energy from escaping without doing something useful first.