The reason millions of people are practicing yoga is that yoga gives us a sense of freedom and expansiveness in our bodies, minds, and spirits. This sense of freedom is different from the endorphin high that people experience in Western exercise. As various poses are mastered, the practitioner experiences enhanced self-esteem -- a sense of mastery of his world. Strength-building poses give us a sense of both internal and external strength, and as we become more flexible in our bodies, we become more flexible in our attitudes. Inversions help us find our internal balance and poise when our lives are upside down. Back bends open our hearts with love and compassion for ourselves and for others.