" This chain method (as some now call it) soon became a hit among writers and fitness enthusiasts—communities that thrive on the ability to do hard things consistently. For our purposes, it provides a specific example of a general approach to integrating depth into your life: the rhythmic philosophy. This philosophy argues that the easiest way to consistently start deep work sessions is to transform them into a simple regular habit. The goal, in other words, is to generate a rhythm for this work that removes the need for you to invest energy in deciding if and when you’re going to go deep. The chain method is a good example of the rhythmic philosophy of deep work scheduling because it combines a simple scheduling heuristic (do the work every day), with an easy way to remind yourself to do the work: the big red Xs on the calendar. Another common way to implement the rhythmic philosophy is to replace the visual aid of the chain method with a set starting time that you use every day for deep work. In much the same way that maintaining visual indicators of your work progress can reduce the barrier to entry for going deep, eliminating even the simplest scheduling decisions, such as when during the day to do the work, also reduces this barrier. "

― Cal Newport , Deep Work: Rules for Focused Success in a Distracted World