You can easily get sidetracked and do menial tasks or check emails, most of which are not important or attend to phone calls, which interrupt your focus on the most important things. By the end of the day, you get exhausted just from the interruptions you get.

Success is not in doing lots of things but rather in doing fewer important things and doing them very well. Once you complete these important tasks well, you will experience a burst of enthusiasm and drive for the rest of the day.

Work in 90-minute cycles – Your brain can only focus for 90 to 120 minutes before it needs a break. Hence, work in cycles of uninterrupted 90 minutes with short breaks in between to maximize productivity.

At the end of the day, it is not how much you do, it is what you do!