specific useful spiritual disciplines

Toward the end of Spirit of the Disciplines, Willard lists some specific disciplines that he considers important:

Disciplines of Abstinence
-solitude
-silence
-fasting
-frugality
-chastity
-secrecy
-sacrifice’

Disciplines of Engagement
-study
-worship
-celebration
-service
-prayer
-fellowship
-confession
-submission

Most interesting are the links he makes between the disciplines, which I will not attempt to explain in detail. As an example, though, he points out that prayer requires time in solitude, and is often enhanced by fasting and study. They are all interlinked, and each person must find the combination of disciplines they need to practice (not the ones that are easy for them!) to grow.