[nabilt]

Something interesting I learned during one of his seminars was that breathing exercises can go a long way in providing most of the benefits. A lot of the media coverage focuses on cold exposure, but deep breathing is really the the core of the message. This is great because it means the barrier to entry is much lower since we all don't need to fill up our tubs with ice every week.

[mettamage]

I agree with this, you can also read that in the PNAS article (multiple links are on this HN thread somewhere).

[gxon]

Can you describe the breathing exercises? Is it literally just sitting and taking deep breaths?

[swader999]

No, you inhale through your nose all the way, then exhale but not all the way out, to the point where you would be pushing it out if you let out more. Repeat 30-40 times. It is circular and continuous, you don't pause. Then exhale all the way out after your 35th cycle. Hold until you feel the intense urge to breath. Then inhale and hold for 15 seconds.

Repeat above 4-5 times. Optional: On the last rep, see how many push ups you can do when you fully exhale. Most people can do 30 to 50% past their max.

[jmkerr]

The free (requires account) official Wim Hof Method App has free guided breathing exercises.