Sadhana: exercises that facilitate detachment
Doubt prevents one from engaging in spiritual Sadhana and attaining knowledge. Bhagavad Gita
Sadhana are a series of spiritual exercises that facilitate detachment from worldly things.
There are authors who identify Sadhana withh Karma Yoga (Selfless Action), Bhakti Yoga (Devotion) and Jnana Yoga (Knowledge) of the Bhagavad Gita. It is a common term used in Yoga Philosophy
«Restrain the lower being by the Higher Being. Subdue the lower mind by the higher mind. It is difficult to conquer desire because it is of a highly complex and incomprehensible nature. But a man of discrimination (discriminated knowledge) and detachment, who practices Sadhana constantly and intensely, can conquer it quite easily. It is doubt that prevents one from engaging in spiritual Sadhana and attaining the highest knowledge and happiness.» Swami Sivananda.
The Dalai Lama, a Buddhist, admired Sri Ramakrishna. In the next sentence we can see that Sadhana can include the practices of other religions. Let us remember that Ramakrishna created the different Hindu schools as well as Islam and Christianity.
«The most suitable and powerful form of Sadhanas.. is the synthesis of the four four paths of Yoga: Karma, Dhyana, Bhakti and Jnana Yoga. In the mind there are three defects, Mala or impurity, Vikshepa or mental wandering, Avarana or veil. Impurity must be removed by practicing Karma Yoga. Mental wandering should be eliminated through worship or Upasana. The veil (of ignorance) must be torn by the practice of Jnana Yoga. Only then is self-realization possible. “Synthesis yoga brings comprehensive development, develops the brain, heart and hand harmoniously and leads to perfection.» Swami Vivekananda.
Sadhana is practiced by Hindus, Buddhists, Sikhs and Jains.
The rest of this summary on “Sadhana” is only available to students of the Gita Institute
Sadhana Bhagavad Gita 
Sadhana.
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