The goal of yoga is to enable ourselves to live happily and freely, and to live life to its full potential. One goal of yoga is to teach how to improve and approach challenges in life with a calm, free, and restful mind, yet awake and aware and not numb. At first sight the two words, challenge and calmness, seem to be contradicting, but they can actually live together. The physical exercises teach the body gradually but steadily to gain more strength, flexibility and stamina, and naturally and intuitively, without strain, the strength, flexibility and stamina of the mind follow. Moreover, the strong distinction between body and mind gradually disappears, and a feeling of union between mind and body is achieved, what is called the body-mind.
Yoga is a truly remarkable system, because it enables one to improve.
In whatever one pleases. Yoga simply gives the tools, which are improvement in patience, stamina, strength, and flexibility of the mind-body. These capabilities reflect in everything one chooses to do. Oh, I forgot perhaps the most important effect of yoga, to my taste. It is the feeling of freedom.