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Stability here does not only mean stability of the posture
but
also the stillness of body
and mind as a whole.
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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.
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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.
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Slackening of efforts and contemplation on infinity are two ways for reaching the above goal.
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In other words, the relaxed condition or effortless maintenance of
an aasana would make the mind free to be attached with the infinity.
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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.
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As one gets adapted or established in an aasana there is
a negligible amount of
involvement of consciousness.
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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.
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Thus, effortlessness, absence of tensions, minimum muscular activity and absence of thought processes by contemplating on the infinite are the characteristics of
aasanas.