Changing your attitude is pretense - you cannot keep it up forever. The yogic system is about fundamental transformation - that is what ultimately counts.

Only what you perceive, you know - the rest is all imagination. Yoga is the science of enhancing perception.

To be in Yoga means to experience the oneness of existence.  

Yoga is about shifting your investments from your body, mind, and emotions to your being - from imagination to reality.

Hatha Yoga is not body-bending business. It is about taking charge of the way you think, feel, and perceive life.