Leaders
There are always plan and lots of self-study for qualities leader development in circular world. How about we, who are in the kingdom of God, do we really care what and who we are? Leadership is natural or could be grown to be a leader? Personally agree there are leaders who naturally born with leadership, but I believe too that leadership can be grown. 1Tim 3:1 anyone desire of the heart, God will give. Therefore we must desire to have one.

While there are many valuable area of development possible to the aspiring leader, some of those, which dynamically affect them, are:
Reading
Constantly read, history, bibliography, political. Not necessary to be in Christian context, but as long as we never stop learning.
Memory
We can test by memorise verses, names, sermon and etc.
Study
Never stop learning and self-study. Here we are talking about self-development.
Language development
Develop ability to communicate and write because with good communication, we can easily express.
Physical development
Physical health, exercise, sound mind us found in the healthy body.
Social skills
Communication. Association with people name, learn to be listener rather then a talker. Learn to ask question for your own benefit.
Organization
Live in ordinary life. Start from your own private place like bedroom and home. Take these as habit we that we can influences people. Dedicate your private place for God. Believe it or not, tidy bedroom bring healthy environments of living.