Earlier quoted context omitted.
It's a hack because it is an unusual or counter-intuitive way of solving a problem. Or meta-solve a problem -- recharge your mental batteries so when you get back you solve your real problem better, if you wish. This is just as much a hack as articles about exercise or nutrition are a hack. They hack the hackers, who ... hack.
Yes, and that's why it's dumb to call articles about exercise and nutrition "hacks". When all of human endeavor falls under the rubric of the "hack" the word ceases to mean anything. Hack your commute, take public transit! Hack your next dinner party with parlour games. Delightfully clever key hack keeps all your keys on the same ring. Hack Mexican food with a "burrito" sized tortilla! Hack your brain with REM sleep.…
Good idea ;-)