You'd think that it would be the opposite, since if you couldn't be bothered to put in the effort to run away from a lion, your chances of breeding were pretty much zero. But preserving energy was incredibly important when you didn't know where your next meal was coming from. If you had to conserve calories, sitting around gave you the best chance of survival. Being lazy literally saved our ancestor's lives. And despite the fact that we are now lounging around watching Netflix instead of shapes in the clouds, our brains haven't changed. They still view putting effort into something as a life-or-death decision.
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This is basically CPR.
In caveman times, we didn't plan ahead for anything, because there was a good chance we'd be dead. We went for instant gratification all of the time. Now time has moved on, but our brain is still stuck in that mindset, wanting to lie on the couch eating ice cream rather than do work. For a lot of us, if we can't see that exerting ourselves is going to result in an immediate payoff, we're not interested. Making detailed plans and following through is hard. You know what's easy? Being lazy and telling ourselves that it isn't really our fault.