“… hatha yoga practice may initially be driven to some extent by narcissism.  After all, hatha yoga can appeal to us because of the powerful way it addresses some of the self’s most cherished preoccupations – health, attractiveness, sexual energy, and longevity.”

– Chip Hartranft, The Yoga-Sūtra of Patañjali: A New Translation with Commentary

Ouch.  Not going to stop, but a good one to keep in mind