Here is a great introduction to tummo (g'tumo or toumo), the secret practice of producing heat and accumulate energy in the path of Vajrayana Buddhism. It seems clear that the practices outlined in this book are there as a guide, the explanations are clear and easy to implement it in order to feel (may be following our attendance) property-facts (even if that as "slagging" subtle channels "). Let us not forget that these are secret practices, so all the keys we are certainly not provided for a result "optimal". And he is happy because Toumo practice alone and without guidance inevitably lead to a catastrophe totally opposite productive.
