ter term YOGA is derived from the sanskrit root yuj Which means to unite join or be in communiion according to the yoga authrites it provides the link which unites the individual soul with the universal soul or God. in physical term the more plausible explanation of the term is the communion between the mind and body.
Example: Total cohesion between your thinking and action. Obviously one does these exercises with more concentration and hence achieve better results.
SARVANGASANA OR SHOULDER STAND