“What do yoga practitioners practice in yoga?”
There are many different types of ‘external yoga practice’ that can be seen or recognized through various physical appearances and activities ‘representing’ different lineage or path under different names and forms or brands and styles, but all kinds of external practice must be accompanied by the internal practice of VIVEKA (right discrimination), VAIRAGYA (dispassion/renunciation), SHATSAMPAT (six fold path) and MUMUKSHUTVA (intense yearning for liberation). Or else, performing many of the different forms of external yoga practice regularly might bring some momentary effects or benefits (the sense of calmness, joyfulness, goodness, meaningfulness, healthiness) to the practitioners, but it doesn’t lead the mind towards the elimination of ignorance and egoism and the complete annihilation of the modification of the mind, which is the ultimate goal of yoga (although there aren’t many yoga enthusiasts are practicing yoga for this reason, and that’s their freedom), transcending all forms of name and form (the mind perception of impermanent pleasant and unpleasant life experiences) as well as all the momentary desirable/non-desirable, agreeable/disagreeable or enjoyable/non-enjoyable side-effects or by-products that may or may not arise throughout the internal and/or external yoga practice.
The external yoga practice is most probably being limited by time, space and causation, while the internal yoga practice is unlimited, transcending all kinds of condition and situation, names and forms that are subject to impermanence and selflessness. As long as there’s the modification of the mind, the practice is always available or present right here and right now. If there’s a ‘limitation’, then this ‘limitation’ is coming from the impure egoistic outgoing passionate mind itself, either rejecting the practice or giving up the practice for some reasons. And even this ‘limitation’ is impermanent.
Those who are endowed with the four means of yoga, might not be seen or recognized from their appearance or activity, as they don’t necessarily have to be performing any particular form of external yoga practice that representing particular lineage or path under a particular name and form or brand and style, although there’s great assistance coming from the external practice to conquer the impure restless state of mind.
It doesn’t matter with or without practicing a particular lineage or path of yoga under certain names and forms or brands and styles, but more importantly, practicing the teachings of yoga to silent the modification of the mind, to free the mind from restlessness deriving from ignorance and egoism, to realize selflessness/oneness/non-separateness/namelessness/formlessness/attributelessness/birthlessness/deathlessness.