I have heard about few types of Yogic practices. For example, Hatha Yoga, Kriya Yoga etc. Exactly how many types of Yogic practices are mentioned in our scriptures? Please give references from Scriptures, not from any secondary sources.
I just want to add one clarification. Here I am not using the term Yoga in the spiritual metaphysical sense. For example, Karma Yoga, Gyana Yoga, Bhakti Yoga - these are different paths for metaphysical gainings. Here I am interested in yogic practices (in physical sense), like a form of exercise kinds of activity, that are mentioned in the Yoga branch of Hindu Philosophy.