Somewhat related anecdote: When a friend of mine was in college, he got into some sort of amicable debate with another friend and they decided the way to resolve it was through a boxing match. Neither of them had an ounce of boxing experience.

My friend realized before the match that just holding the gloves up and swinging punches is more tiring than you'd think. So the strategy he settled on was to just put his guard up and not attack at all. He let his friend take a bunch of swings at him until eventually the poor guy was literally too tired to hold his arms up. Then my friend started swinging and quickly won.