Wim Hof Method
I came across this from a friend of mine when I was searhing for a meditation style a while back. I was able to complete a full month of continuous meditation daily but have since dropped down a little. Now I incorporate it again to keep myself healthy physically, mentally and spiritually (Body, mind and feelings).
Today I did only one round but it depends on the day. I’ve done as much as four rounds a day.
If you are interested check out this website:
And here is a speed-up version of one of the times I’ve done this: