How can yoga help with specific physical ailments such as lower back pain?

Human anatomy is God-made at birth and becomes man-made as he grows. Yogic practice helps one to understand the divine anatomy and not the habituated anatomy formed by one’s habits and manners.

Each asana (posture) has to be performed correctly in order to rectify bad habits. While performing asana one has to judiciously adjust the anatomy without distorting the muscles or joints. If there is anatomical distortion then it is not an asana. That is why my emphasis is on alignment, which is a guide for enlightenment. As they guide the body in the right direction the feeling of well-being is felt in the body and elation of freshness in mind is experienced. This naturally leads one to experience equipoise and oneness in body, mind and self.

Could you choose a pose that you feel you’ve learned from and explain the physical, emotional, and spiritual effects you’ve experienced from it?

It requires pages and pages to write on it. If you read the whole book you can get the answer to your question.

This much I say here: the physical strength, mental strength, nervous strength, and intellectual strength should balance evenly by working in concord with all parts of the body, so that the core of the being, the intelligence, and consciousness concurrently and uniformly move with all parts of the body. — Beliefnet.com (Concluded)