Prayer is not natural. The natural man is not given to prayer except in crisis. Initially, our lives are not spiritual but natural, and so it is with prayer. The spiritual man puts the spiritual life first. The mark of a spiritually potent person is prayer.
Prayer produces spiritual muscle.
Run to the heart of God, not from him. Share your heart. You may be sound in willpower, physical strength, moral fiber and mental toughness, but vibrancy in prayer is more to be desired. The absence of prayer is testimony to your ability. The presence of prayer is testimony to God's ability.