The word yoga means "union" in Sanskrit, the language of ancient India where yoga originated. We can think of the union occurring between the mind, body and spirit.

What is commonly referred to as "yoga" can be more accurately described by the Sanskrit word asana, which refers to the practice of physical postures or poses.

Asana is only one of the eight "limbs" of yoga, the majority of which are more concerned with mental and spiritual well being than physical activity. In the West, however, the words asana and yoga are often used interchangeably.

Many people think that yoga is just stretching. But while stretching is certainly involved, yoga is really about creating balance in the body through developing both strength and flexibility. This is done through the performance of poses or postures, each of which has specific physical benefits. The poses can be done quickly in succession, creating heat in the body through movement (vinyasa-style yoga) or more slowly to increase stamina and perfect the alignment of the pose. The poses are a constant, but the approach to them varies depending on the tradition in which the teacher has trained.

Yoga teachers will often refer to "your practice," which means your individual experience with yoga as it develops over time. The amazing thing about yoga is that your practice is always evolving and changing, so it never gets boring. Although the poses themselves do not change, your relationship to them will. Anyone can start a yoga practice, even if you don't feel like you are very flexible or very strong. These things will develop over time. Another great thing about thinking about "your practice" is that it encourages the noncompetitive spirit of yoga. One of the most difficult, but ultimately most liberating things about yoga is letting go of the ego and accepting that no one is better than anyone else. Everyone is just doing their best on any given day.

You've probably heard that yoga is good for you. Maybe you have even tried yoga and discovered that it makes you feel better. But what are the specific health benefits can you expect to enjoy from doing yoga regularly?

Physical Benefits

Flexibility: Stretching your tight body in new ways will help it to become more flexible, bringing greater range of motion to muscles and joints. Over time, you can expect to gain flexibility in your hamstrings, back, shoulders, and hips.

Strength: Many yoga poses require you to support the weight of your own body in new ways, including balancing on one leg (such as in Tree Pose) or supporting yourself with your arms (such as in Downward Facing Dog). Some exercises require you to move slowly in and out of poses, which also increases strength.

Muscle tone: As a by-product of getting stronger, you can expect to see increased muscle tone. Yoga helps shape long, lean muscles.

Pain Prevention: Increased flexibility and strength can help prevent the causes of some types of back pain. Many people who suffer from back pain spend a lot of time sitting at a computer or driving a car. That can cause tightness and spinal compression, which you can begin to address with yoga. Yoga also improves your alignment, both in and out of class, which helps prevent many other types of pain.

Better Breathing: Most of us breathe very shallowly into the lungs and don't give much thought to how we breathe. Yoga breathing exercises, called Pranayama, focus the attention on the breath and teach us how to better use our lungs, which benefits the entire body. Certain types of breath can also help clear the nasal passages and even calm the central nervous system, which has both physical and mental benefits.

Mental Benefits

Mental Calmness: Yoga asana practice is intensely physical. Concentrating so intently on what your body is doing has the effect of bringing a calmness to the mind. Yoga also introduces you to meditation techniques, such as watching how you breathe and disengagement from your thoughts, which help calm the mind.

Stress Reduction: Physical activity is good for relieving stress, and this is particularly true of yoga. Because of the concentration required, your daily troubles, both large and small, seem to melt away during the time you are doing yoga. This provides a much-needed break from your stressors, as well as helping put things into perspective. The emphasis yoga places on being in the moment can also help relieve stress, as you learn not to dwell on past events or anticipate the future. You will leave a yoga class feeling less stressed than when you started.

Body Awareness: Doing yoga will give you an increased awareness of your own body. You are often called upon to make small, subtle movements to improve your alignment. Over time, this will increase your level of comfort in your own body. This can lead to improved posture and greater self-confidence.