The eight limbs

You read in many places and hear from many people, many yogi and yogini included that 'yoga is not a religion'. I guess thats true to a point, however yoga is a spiritual path and is derived from a specific perspective on the universe. A practitioner may or may not subscribe to that perspective, or perhaps to parts of it, but frankly (as a well known yoga teacher once said) practising asana (yoga postures/positions) without attention to the 'eight limbs' of yoga is just gymnastics...