The word yoga, from the Sanskrit word yuj means to yoke or bind and is often interpreted as "union" or a method of discipline. A male who practices yoga is called a yogi, a female practitioner, a yogini.

The Indian sage Patanjali is believed to have collated the practice of yoga into the Yoga Sutra an estimated 2,000 years ago. The Sutra is a collection of 195 statements that serves as a philosophical guidebook for most of the yoga that is practiced today. It also outlines eight limbs of yoga: the yamas (restraints), niyamas (observances), asana (postures), pranayama (breathing), pratyahara (withdrawal of senses), dharana (concentration), dhyani (meditation), and samadhi (absorption). As we explore these eight limbs, we begin by refining our behavior in the outer world, and then we focus inwardly until we reach samadhi (liberation, enlightenment).

Today most people practicing yoga are engaged in the third limb, asana, which is a program of physical postures designed to purify the body and provide the physical strength and stamina required for long periods of meditation.

The word hatha means willful or forceful. Hatha yoga refers to a set of physical exercises (known as asanas or postures), and sequences of asanas, designed to align your skin, muscles, and bones. The postures are also designed to open the many channels of the body–especially the main channel, the spine–so that energy can flow freely.

Hatha is also translated as ha meaning "sun" and tha meaning "moon." This refers to the balance of masculine aspects–active, hot, sun–and feminine aspects–receptive, cool, moon–within all of us. Hatha yoga is a path toward creating balance and uniting opposites. In our physical bodies we develop a balance of strength and flexibility. We also learn to balance our effort and surrender in each pose.

Hatha yoga is a powerful tool for self-transformation. It asks us to bring our attention to our breath, which helps us to still the fluctuations of the mind and be more present in the unfolding of each moment.

Om is a mantra, or vibration, that is traditionally chanted at the beginning and end of yoga sessions. It is said to be the sound of the universe. What does that mean?

Somehow the ancient yogis knew what scientists today are telling us–that the entire universe is moving. Nothing is ever solid or still. Everything that exists pulsates, creating a rhythmic vibration that the ancient yogis acknowledged with the sound of Om. We may not always be aware of this sound in our daily lives, but we can hear it in the rustling of the autumn leaves, the waves on the shore, the inside of a seashell.

Chanting Om allows us to recognize our experience as a reflection of how the whole universe moves–the setting sun, the rising moon, the ebb and flow of the tides, the beating of our hearts. As we chant Om, it takes us for a ride on this universal movement, through our breath, our awareness, and our physical energy, and we begin to sense a bigger connection that is both uplifting and soothing.

Yoga is not a religion. It is a philosophy that began in India an estimated 5,000 years ago. The father of classical ashtanga yoga (the eight-limbed path, not to be confused with Sri K. Pattabhi Jois' Ashtanga yoga) is said to be Patanjali, who wrote the Yoga Sutra. These scriptures provide a framework for spiritual growth and mastery over the physical and mental body. Yoga sometimes interweaves other philosophies such as Hinduism or Buddhism, but it is not necessary to study those paths in order to practice or study yoga.

It is also not necessary to surrender your own religious beliefs to practice yoga.

Unlike stretching or fitness, yoga is more than just physical postures. Patanjali's eight-fold path illustrates how the physical practice is just one aspect of yoga. Even within the physical practice, yoga is unique because we connect the movement of the body and the fluctuations of the mind to the rhythm of our breath. Connecting the mind, body, and breath helps us to direct our attention inward. Through this process of inward attention, we learn to recognize our habitual thought patterns without labeling them, judging them, or trying to change them. We become more aware of our experiences from moment to moment. The awareness that we cultivate is what makes yoga a practice, rather than a task or a goal to be completed. Your body will most likely become much more flexible by doing yoga, and so will your mind.

Yoga is amazing–even if you only practice for one hour a week, you will experience the benefits of the practice. If you can do more than that, you will certainly experience more benefits. I suggest starting with two or three times a week, for an hour or an hour and a half each time. If you can only do 20 minutes per session, that's fine too. Don't let time constraints or unrealistic goals be an obstacle–do what you can and don't worry about it. You will likely find that after awhile your desire to practice expands naturally and you will find yourself doing more and more.

Many. There are four paths of Yoga: 1)Jnana, the path of knowledge or wisdom; 2)Bhakti, the path of devotion; 3) Karma, the path of action; and 4) Raja, the path of self control. Hatha Yoga, which includes postures and breathing, and is the form most popular in the West, is actually part of Raja Yoga, the path of self control. The path most followed in India is thought to be Bhakti Yoga, the path of devotion. Within Hatha Yoga there are many styles, such as Iyengar, Astanga, Integral, Kripalu and Jiva Mukti, to name a few. These Yogas all share a common lineage back to Patanjali's Yoga Sutras, a text outlining the basic philosophy and practices of Classical Yoga. It was written sometime between the second century B.C. and the first century A.D

Yes. Western science has been studying Yoga for nearly 50 years, and the evidence shows numerous physical and psychological benefits from Yoga. Interestingly, there seems to be something about Yoga -- vs. exercise and controlled breathing -- that is beneficial. For example, a recent study with heart patients showed that those who followed a stress reduction program that included many Yoga practices did better than patients who exercised or did nothing. Further, preliminary studies in the United States and India suggest that Yoga maybe helpful for specific conditions, such as asthma, epilepsy, anxiety, stress and others.

Yes and...maybe. Aerobic exercise is simply exercise that improves oxygenation of the blood through an increased heart rate and deeper breathing. Yoga can do that, especially those styles such as Astanga and ViniYoga that have a strong focus on the flow of one posture to another

Yoga is an ancient practice with a written history going back thousands of years. It is not New Age, although various New Age movements have adopted and adapted elements of Yoga. In addition, Yoga and New Age movements share a focus on mind/body development

Traditional exercise is goal oriented: How many push ups can I do? Can I touch my toes? I'm going to do 10 more crunches today than I did yesterday. Yoga, by contrast, is a process. The idea is to focus your awareness on what you are doing and how you feel as you perform the postures. In exercise, you fail if you miss your goal. In Yoga, you succeed by trying. There's also a difference on the physical level. Weight training, for example, makes you stronger by breaking down and rebuilding muscle tissue. It's this breaking down and rebuilding that results in the bulky muscle look. Yoga increases strength by toning the muscles

Yoga can make you look and feel better, regardless of your weight. That said, Yoga can help you slim down in a couple of ways. First, the exercises will help you burn calories. In addition, they'll help tone your muscles and improve of your posture. Yoga is also about healthy living, which includes a healthy diet. That doesn't mean you have to become a vegetarian, just that you should be conscious of the foods you eat, sticking with natural, fresh fruits and vegetables, grains, etc. as much as possible while limiting your intake of junk food and foods high in fat, like red meat. Any of the basic hatha styles will help. The important thing is to practice daily (or at least 4-5 days a week). If possible, try and find a teacher. Books, videos and website can be a great help, but nothing beats a live instructor

Any one of the basic styles can be physically challenging. It depends on what you do and how you approach it. Some styles focus on holding postures for a long time, which can be very challenging, while others link a series of postures into a single flow, which results in physical workout. Ashtanga, Bikram's, Iyengar and Power Yoga are probably the most physically focused forms of Yoga.

It's okay to continue practicing Yoga while you are pregnant as long as you were practicing before conception. Yoga is a great way to keep fit during pregnancy. In particular it can help strengthen the pelvic area, normalize thyroid functioning and blood pressure, and help keep you calm and relaxed -- all of which is good for the baby, too. In general, however, you want to avoid strain, compressing the belly or abdomen and inverted postures, especially in the later stages.

Mostly it's a matter of personal preference. Some women don't want to do Yoga during their period, many don't mind and continue to practice during menses. For women who do choose to practice, it is suggested that they avoid inverted poses, abdominal strengtheners, extended holding of any pose, or energizing breaths (kapalabhati). The issue is that these practices might interfere with the downward flow or cause discomfort.

Sometimes. Studies have shown that certain Yoga practices can help some patients control their high blood pressure. In general, Yoga promotes health, a sense of calm and relaxation. In addition, it teaches you to be aware of your body and to listen to the signals it sends -- all of which can be very useful.

Specific techniques that may be helpful controlling high blood pressure include diaphragmatic or belly breathing, which has been shown to reduce stress and induce relaxation, and a pranayama (controlled breathing) technique called Nadi Shodhana, or alternate nostril breathing, which also helps reduce stress and induce relaxation. Moreover, there have been a number of studies that show meditation can be a great help in controlling high blood pressure.

Certain Yoga postures should be avoided, however, if you have high blood pressure, including the shoulderstand, headstand and downward dog. There are also a number of postures that you should approach with caution and not hold for extended periods of time (more than a few breaths). These include Warrior I and II, Mountain, Triangle, Half Moon, Tree, Standing Squat and Symbol of Yoga.

In general, the combined practice of Yoga postures, meditation and pranayama breathing helps reduce stress and anxiety levels. It also helps build feelings of confidence and well-being and creates a stronger sense of self, all of which can help reduce levels of social anxiety. In addition, some of the practices -- such as Nadi Shodhana and other breathing techniques -- can help alleviate the symptoms of an anxiety attack. Yoga also teachers greater self awareness of mind and body. With practice, you may begin to sense the conditions that lead up to an attack and deal with them before they get out of control. It's important to start and maintain a regular practice. You should feel some immediate temporary relief, but it may take several months before you notice significant change

All you really need to begin practicing yoga is your body, your mind, and a bit of curiosity. But it is also helpful to have a pair of sweat pants, leggings, or shorts, and a t-shirt that's not too baggy. No special footgear is required because you will be barefoot. It's nice to bring a towel to class with you. As your practice develops you might want to buy your own yoga mat, but most studios will have mats and other props available for you.

Yes! You are a perfect candidate for yoga. Many people think that they need to be flexible to begin yoga, but that's a little bit like thinking that you need to be able to play tennis in order to take tennis lessons. Come as you are and you will find that yoga practice will help you become more flexible.

This newfound agility will be balanced by strength, coordination, and enhanced cardiovascular health, as well as a sense of physical confidence and overall well-being.

The first principle of yoga philosophy is ahimsa, which means nonharming to self and others. Some people interpret this to include not eating animal products. There is debate about this in the yoga community–I believe that it is a personal decision that everyone has to make for themselves. If you are considering becoming a vegetarian, be sure to take into account your personal health issues as well how your choices will affect those with whom you live. Being a vegetarian should not be something that you impose on others–that kind of aggressive action in itself is not an expression of ahimsa.