This is all about pushing your limits. When you feel saturated and think that you cannot sustain your level of concentration for another minute, convince yourself to give in five more minutes. Force yourself to read a couple of more pages. Tackle two more problems and so on. Right when the temptation to give up hits you, push for another five minutes. Those five minutes count a lot. This is akin to athletes and bodybuilders who train to go past the point of exhaustion and develop their strength and stamina. Similarly, push your mind and heighten the concentration levels.

Please refer to the book for more details on this activity.