Alignment Based Hatha Yoga, or in its short form Alignment Yoga, is a style of Hatha Yoga that focuses on the correct alignment of the body in the yoga postures.
The late Guruji B. K. S. Iyengar pioneered this style, which is now known worldwide as Iyengar Yoga. Hatha Yoga describes the third and fourth steps in Raja Yoga (one of the four main directions of yoga).
It is a preparatory phase that prepares the body for meditation through asana (postures), pranayama (breathing techniques), and proper diet and lifestyle, and seeks to balance the dualistic body and mind - knowing that these polarities are a natural part of life and are constantly in flux. For a more detailed description and how we engage the heart energy, see here - blog post: What is Alignment Yoga.