Found in 2 comments on Hacker News
mtalantikite · 2019-11-26 · Original thread
Tummo is explained pretty well in “The Bliss of Inner Fire” [1]. The practices from Vajrayana Buddhism are very different than what you’d find in a Theravada vipassana practice. It relies on lots of visualizations and breath work.


moozilla · 2010-12-31 · Original thread
You might start here:

If you're interested in how to perform the actual meditation, this is a great book:

Fresh book recommendations delivered straight to your inbox every Thursday.