Nagaremasu

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Nagaremasu is an ancient meditation that allows complete control over chakra and ability to see all chakra, even in small amounts. This was first used by the Sage of the Six Paths. It was then used by his sons (the Uchiha clan ancestor and the Senju clan ancestor) and couldn't be used by most of his followers due to the fact that most didn't have sufficient chakra viewing abilities. Soon after, the Satoru Clan (who were always hated by the Uchiha), who gained complete mastery over it equal to that of the Sage himself, used it and it was slowly forgotten to all but a few clans and people (the Satoru, the Uzumaki, some Uchiha, the people who had read the Uchiha clan Tablet and the Senju clan).

Process
Before meditation, the user has to conquer their inner chakra (Yin chakra (as their physical energy is their Yang chakra), so they can literally combine their Yin and Yang chakra (this led to Shinsuke creating the Yin-Yang Release Shroud) instead of using it simultaeneously) form. They do this by temporarily (until they have conquered their chakra) releasing all restraints on their chakra and releasing it all (sometimes even more than the user thought they had, as it literally releases all), which results in an enormous amount of chakra on an abnormally large level, with some people's being at Tailed-Beast level and with some even higher. They then meditate and enter their inner world where they can face their Yin chakra's form (in Shinsuke's case a dragon), tame it and become one with it. This is a prequisite to the Yin-Yang Release Shroud. They then regain conciousness and return their chakra to normal. They are fatigued from the giant chakra release.

After resting, they go back to meditate and this time they close their eyes, imagine their chakra and get accustomed to the flow around the body and they fix any chakra blockages with their mind chakra (Yin-Chakra). They meditate and carry on imagining the flow and open their eyes. They practice flowing chakra outside of their body and controlling it with Yin-Chakra even if its outside their body. They then go and meditate and create a Training area using Yin-chakra in their inner world where they face all the strongest enemies they have ever fought using only chakra flow.