Linked from
The 8 pages that link to Tummo, each with the reason it gives.
KagyuBroader topic: It is one of the Six Dharmas practiced in Kagyu meditation traditions.
Subtle bodyBroader topic: Tummo provides a specific example of working with channels and winds.
NaropaBroader topic: It is commonly treated as the first of the Six Dharmas.
Trul khorRelated: Tummo illustrates how Tibetan yogic methods use breath and subtle-body imagery.