Develop their will should be gradual. She also always in need of stimulation. Without it, she just can dry out. To cultivate one's willpower, especially starting with regular employment. This may be a sport or any educational programs. Calculate the load and get down to business.
Of course, should start small, but over time, increase the load. Regular performance of specific tasks allow you to cultivate one's inner strength. You will begin to feel responsible to the business, which is engaged. Even a tiny thing, the process itself is important. Gradually, you will begin to get stronger mentally. Subsequently, it can be very useful to you in life. Strong will prepare you for any life woes.
Within each person lives his second "I" that is constantly prevents him live. For example, when the alarm goes off, the inner "I" tells you that you can get some more sleep. So, this is internally "I" need to stop listening. Treat this categorically. Firmly follow the goals, not allowing knock you off your path.
Cultivate inner strength help, oddly enough, a favorite thing. This will allow you to kill two birds with one stone. You will feel the responsibility that you will be a joy, but also you will do exactly what you want.
Develop the will and everyone can, and most importantly be willing to strive for it.