• Stability here does not only mean stability of the posture but also the stillness of body and mind as a whole. 

• Even if we are physically stable in aasana, we may remain mentally unstable due to various disturbing sensory inputs. Only the stability of both body and mind together would lead to the sense of well-being.

• Also, it does not mean that any posture which is easy to attain and comfortable to maintain is an aasana. A postural pattern, particularly in a sitting condition leading towards physical and mental stability and a sense of well-being, is an aasana.

• Slackening of efforts and contemplation on infinity are two ways for reaching the above goal. 

• In other words, the relaxed condition or effortless maintenance of an aasana would make the mind free to be attached with the infinity.

• There is least disturbance to the body as there is no discomfort in any part of the body, due to more or less relaxed musculature. 

• As one gets adapted or established in an aasana there is a negligible amount of involvement of consciousness.

• When the consciousness is directed to infinity, no stimulus is likely to arise from it. Now here the postural pattern is maintained below the level of consciousness; directed to infinity and no stimulus is likely to arise from it. 

• Thus, effortlessness, absence of tensions, minimum muscular activity and absence of thought processes by contemplating on the infinite are the characteristics of aasanas.

• When the above-mentioned principles are followed during practice, the neuromuscular activity is smoothly executed e.g. contraction of the biceps and the relaxation of the triceps of the arm occurring at the same time helps smooth bending and stretching of the elbow joint. 

• These opposite types of functions or forces are spread over in every system of the body and a smooth harmonious working of the body and mind depends upon a judicious reciprocity in such two opposite functions. 

So, if the aasanas are done in a proper way as said above, there would be no clashes between such opposite (internal) mechanisms. Aasanas would bring a balance in all such reciprocal functions.