A number of years ago, while I was taking a “yoga for seniors” workshop, the conversation turned philosophical. A student asked, “If yoga means ‘union’ then why does the Yoga Sutras define yoga as ‘stopping the fluctuations of the mind?’”
 
Before the presenter could answer, another student jumped up, thrust her hand out in a “stop” mudra and announced, “If it’s not in the Yoga Sutras, it’s NOT yoga!”   
 
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