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[1] https://www.youtube.com/watch?v=0tX0M6EveGY
[2] https://www.youtube.com/watch?v=tybOi4hjZFQ
30 mins. Everyday after brush.
I also practice Surya Namaskar[1] + 2 minute push-ups[2] + 2 minute mountain climbing after the 30 mins breathing.
[1] https://www.youtube.com/watch?v=IKzkc3FWx7g
[2] https://www.youtube.com/watch?v=uYbHEcYbHmI
I have just been practicing Sudarshan Kriya[1] + Wim Hof[2] + Surya Namaskar[3] (no push-ups and mountain climbing) for the past month.
~1 hour a day.
[3] https://www.youtube.com/watch?v=IKzkc3FWx7g