Samkhya
Samkhya is one of the oldest and most influential Indian philosophies, but not well known in the west. It is the key to understanding ancient Indian thought. Old School Yoga strives to present a secular, topical, modern understanding of the ancient philosophy.
Yoga
Patanjali’s Yoga Sutras are considered to be the authoritative text of Yoga philosophy. It’s meaning is greatly clarified when one understands Samkhya philosophy. Old School Yoga presents topical and practical material based on the Sutras.
Kundalini
Old School Yoga advocates the Vedanta school of Kundalini, i.e., as taught by the Yoga-Kundalini Upanishad and 20 Yoga Upanishads. This is a different tradition than Samkhya-Yoga, but not incompatible.