The amazing thing is Yoga indeed can give you quite a great deal of all what has just been summed up. Not from one day to the next, no, for Yoga is a process of growing steadily, of ripening. Yoga has nothing whatsoever to do with acrobatics, is no fancy fashion, no whims and tricks, no ascetism, no gymnastics, no physical education, no secret Eastern hocus-pocus. Yoga does not solve all problems of life, but sheds new light on them, so as to make it possible for us to tackle with them in a different but much more efficient way. Yoga is a remarkable school of discipline that confronts you with someone you know so little of - yourself .
Yoga is a way of life.
You can read more about these ideas in The Science of Yoga or The Yoga-Sutras of Patanjali by I. K. Taimni.