Yoga isn't just asanas. That's superficial.Eight sutras of Patanjali the eight-fold path of yoga:1. Yama: moral. No injury to others.2. Niyama:Purity of mind and body, contentment,self-discipline.3. Asana: Postures 4. Pranayama: Breath control. life currents of body5.Pratyahara:Withdrawing of senses from external objects.6. Dharana: Focus,mind on one thought or subject.7. Dhyana: Meditation.Reaching bliss, peace, light, wisdom, in this universe.8. Samadhi: Consciousness.One with soul.