Sadhana means a daily spiritual practice. It is about setting a daily routine and building a devotional practice.
“What is sadhana? It’s a committed prayer. It is something which you want to do, have to do, and which is being done by you. … Sadhana is self-enrichment. It is not something which is done to please somebody or to gain something. Sadhana is a personal process in which you bring out your best.”-Yogi Bhajan