Ananda Yoga is a classical style of hatha yoga that uses asana and pranayama to awaken, experience, and begin to control the subtle energies within oneself, especially the energies of the chakras. Its object is to use those energies to harmonize body, mind, and emotions, and above all to attune oneself with higher levels of awareness. One unique feature of this system is the use of silent affirmations while in the asanas as a means of working more directly and consciously with the subtle energies to achieve this attunement. Ananda Yoga is a relatively gentle, inward experience, not an athletic or aerobic practice. It was developed by Swami Kriyananda, a direct disciple of Paramhansa Yogananda, author of the spiritual classic, Autobiography of a Yogi.

Anusara (a-nu-SAR-a) means, "to step into the current of Divine Will", "following your heart", "flowing with Grace", "to move with the current of divine will." A new style developed by John Friend, Anusara yoga is described as heart-oriented, spiritually inspiring, yet grounded in a deep knowledge of outer and inner body alignment. Each student’s various abilities and limitations are deeply respected and honored.

For those who want a serious workout, Ashtanga may be the perfect yoga. Developed by K. Pattabhi Jois, Ashtanga is physically demanding. Participants move through a series of flows, jumping from one posture to another to build strength, flexibility and stamina. It's not for beginners or anyone who's been taking a leisurely approach to fitness. The so-called Power Yoga is based on Ashtanga.

Bikram Choudhury's yoga is hot, hot, hot, so be prepared to sweat, sweat, sweat. In class, they crank the thermostat up high, then perform a series of 26 asanas designed to "scientifically" warm and stretch muscles, ligaments and tendons. Founder Bikram Choudhury studied yoga with Bishnu Ghosh, brother of Paramahansa Yogananda

Developed by Swami Satchidananda, the man who taught the crowds at the original Woodstock to chant "Om," Integral classes put almost as much emphasis on pranayama and meditation as they do on postures. Integral yoga is used by Dr. Dean Ornish in his groundbreaking work on reversing heart disease.

Ever think standing was just a matter of keeping your body on top of your legs? It's hard to appreciate how involved a simple thing like just standing can be, how much concentration and how many subtle movements and adjustments it takes, until you take an Iyengar yoga class. Of course, the point is that you're not just standing. You're doing Tadasana, Mountain pose, and in yoga in the style of B.K.S. Iyengar, Tadasana is an active pose. B.K.S. Iyengar is one of the best-known yoga teachers and the creator of one of the most popular styles of yoga in the world. His style of yoga is noted for great attention to detail and the precise alignment of postures, as well as the use of props such as blocks and belts. No doubt part of Iyengar's success is due to the quality of teachers, who must complete a rigorous 2-5 year training program for certification.