Amazing Nauli Kriya ( Vacuum hatha yoga) [advanced exercise abs six pack]
Nauli - is the practice of reducing and isolating the rectus abdominis.
When the rectus abdominis rotate left (counter-clockwise), it is called dakshina - Nauli.
When they turn right (clockwise), it Vama - Nauli.
When muscles are pulled together and serves the middle group of muscles, it is madhyama Nauli.
I advise you to start with a simple:
1 - learn and practice daily breath hold for 8 seconds on fir