People waste lifetimes thinking they are working hard but are really just puttering around.
It's been stated by authors (I mentioned Tony Shwartz in another comment and I highly recommend his book) but I offer this analogy:
Consider you are standing next to a roaring river. It is treacherous. It is dangerous. On the other side, it looks like it's a lot nicer (more grass, nicer setting, maybe a picnic table all set up) than the side you are standing on.
Sure would be nice to get over there. But man, to swim that current...dangerous. So maybe you could build a raft? You start looking for wood, something to put it together. Can't find anything. You try looking at the river to see if there's an easier way to cross. Maybe some shallows? Not sure.
Then, behind you, suddenly there is a pack of lions. They look hungry. They ARE hungry. And they see you. And they start loping your way, drool dripping from their teeth. This ain't Hobbs. This is real. These lions are going to literally rip you apart and it's going to happen in a few seconds.
How long does it take you to get across that river now? Are you still going to try and build a raft? Still going to look for a shallow end?
Still going to worry about getting wet?
Focus is a curious thing. We think are 100% committed to something, but we are really not. We achieve what we are truly focused on.
I mean, it sure FELT like you were working 100% on getting across the river when you were trying to lash together a raft and when you were scouting the river for an easy way across. But when it meant getting across or being eaten, THAT'S when you focused truly 100%.
The secret is learn how to FOCUS, truly focus, put your entire mind intensely on the most important task...then take a break, recover. Then do it again. And wow...does it ever work.