What is strong willed person? For me it is man, guided by discipline and purposefully going toward the goal. What does it mean in reality to have strong will? I guess you had heard in some kind of conversation such question: "how you have so much will?" Usually after these words come others – "I would not be able to do so..." It seems like a solid will is just an exclusive grace, provided not for everyone.
Strong will is idealized and considered as inspirational, but people are claiming that they had no will, believe that in order to become strong willed person, they must to overcome long way of limitation, put in permanent efforts.
I think right are those who claim that a strong will can be developed by everyone, just need discipline yourself. Most importantly how we understand will and how we develop it.