[Some sages] offer the prana into the apana; likewise, others offer the apana into the prana. Having controlled both the courses of the prana and apana, the same sages offer the pranas into pranas.

There are some who practise control of the Vital Energy and govern the subtle forces of Prana and Apana, thereby sacrificing their Prana unto Apana, or their Apana unto Prana.

Others, with restricted diet, are devoted to the control of breath. Some sacrifice the inward breath in the outward breath. Similarly others sacrifice the outward breath in the inward breath. Some others, stopping the flow of both the inward breath and the outward, sacrifice the inward breaths and outward breaths.

Constantly practising control of the vital forces by stopping the movements of the outgoing and the incoming breaths, some offer as a sacrifice the outgoing breath in the incoming breath; while still others, the incoming breath in the outgoing breath.

Others offer as sacrifice the outgoing breath in the incoming, and the incoming in the outgoing, restraining the courses of the outgoing and the incoming breaths, solely absorbed in the restraint of the breath.