Physical benefits
1. flexibility: stretching your tight body in a new way will help it to become more flexible, bringing greater range of motion to muscles and joints
2. Strength: many Yoga poses require you to support the weight of your own body in a new ways, like balancing on one leg (tree pose)
3. Muscle tone: As a by-product of getting stronger, you can expect to see the increased muscle tone
4. Pain Prevention: Increased flexibility and strength can help prevent the causes of some types of back pain.
5. 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
1. Mental Calmness: 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.
2. 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.
3. 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.
Yoga also helps to develop personality at Physical, Mental, Emotional, Intellectual and Spiritual level, which is dormant with in each individual