People can do incredible things. I watched an interview of Stig Severinson the other day. Apart from coming across as a really nice guy, what he can do is literally mind blowing.
How long can you hold your breath? This Danish freediver, described as a super human for his insane ability to hold his breath, seems to go on forever. And he has an equally insane passion for taking on seemingly impossible challenges. He holds multiple world records in his field of breath holding during crazy dives.
Holding a degree in biology and a Ph.D. in medicine, he travels the world training athletes, Defence Force personnel and others, in breath holding and mental training techniques.
His online site, Breatheology, offers free and online courses teaching people how to
‘Improve Your Health & Become a Better Version of You
Through Better Breathing & Breath Holding’
Raili Tanska
Breathe…..
soulgifts - Telling Tales 
Those freedivers are amazing. I don’t see how they do it.
I know. It’s a lot of training I believe.