In general, will is a very useful thing to have. After all, it allows a person to overcome factors that would make his decisions for him, such as pain, fear, anger, fatigue, lust or weakness. I would, of course, be remiss to not mention that the will can be used to overcome generally positive factors such as compassion, love and mercy as well. The will, as Kant noted, can apparently select good or evil with equal resolve. However, I will set aside the concern regarding the bad will and focus on training the will.
Based on my own experience, the will is rather like stamina—while people vary in what they get by nature, it can be improved by proper training. This, of course, nicely matches Aristotle’s view of the virtues.
While there are no doubt many self-help books discussing how to train the will with various elaborate and strange methods, the process is actually very straightforward and is like training any attribute. To be specific, it is mainly a matter of exercising the capacity but not doing so to excess (and thus burning out) or deficiency (and thus getting no gain). To borrow from Aristotle, one way of developing the will in regards to temperance is to practice refraining from pleasures to the proper degree (the mean) and this will help train the will. As another example, one can build will via athletic activities by continuing when pain and fatigue are pushing one to stop. Naturally, one should not do this to excess (because of the possibility of injury) nor be deficient in it (because there will be no gain).
As far as simple and easy ways to train the will, meditation and repetitive mental exercises (such as repeating prayers or simply repeated counting) seem to help in developing this attribute.
One advantage of the indirect training of the will, such as with running, is that it also tends to develop other resources that can be used in place of the will. To use a concrete example, when a person tries to get into shape to run, sticking with the running will initially take a lot of will because the pain and fatigue will begin quickly. However, as the person gets into shape it will take longer for them to start to hurt and feel fatigued. As such, the person will not need to use as much will when running …
Read more: Mike LaBossiere, Talking Philosophy