Because Kriya Yoga is an initiatory tradition. The techniques require:
Here, the practitioner moves beyond simple spinal breathing to controlling the five prana vayus (sub-energies): Prana, Apana, Samana, Udana, and Vyana. 144 kriya yoga techniques pdf
These 36 techniques are rarely taught publicly, as they require a nervous system completely desensitized to sensory pleasures. Because Kriya Yoga is an initiatory tradition