 According to the Yoga Sutras of Patanjali, one of the ancient texts  that is the basis for the philosophy behind yoga, there are eight  “limbs” (Ashtanga  in Sanskrit) of yoga. Each limb relates to an aspect of achieving a  healthy and fulfilling life, and each builds upon the one before it. You  may be surprised to hear that only one of the limbs involves the  performance of yoga postures. Here is a description of the eight limbs.
According to the Yoga Sutras of Patanjali, one of the ancient texts  that is the basis for the philosophy behind yoga, there are eight  “limbs” (Ashtanga  in Sanskrit) of yoga. Each limb relates to an aspect of achieving a  healthy and fulfilling life, and each builds upon the one before it. You  may be surprised to hear that only one of the limbs involves the  performance of yoga postures. Here is a description of the eight limbs.1. Yama:
Five ethical guidelines  regarding moral behavior towards others:  Ahimsa: Nonviolence  
Satya: Truthfulness
Asteya: Nonstealing
Brahmacharya: Nonlust
Aparigraha: Noncovetesness
Satya: Truthfulness
Asteya: Nonstealing
Brahmacharya: Nonlust
Aparigraha: Noncovetesness
2. Niyama:
Five ethical  guidelines regarding moral behavior towards oneself:  Saucha: Cleanliness  
Santosa: Contentment  
Tapas: Sustained practice  
Svadhyaya: Self study  
Isvara pranidhana: Surrender to God
3. Asana:
Practice of yoga  postures.
4. Pranayama:
Practice  of breathing exercises.
5. Pratyahara:
Withdrawal  of the senses, meaning that the exterior world is not a distraction  from the interior world within oneself.
6.  Dharana:
Concentration, meaning the ability to focus on  something uninterrupted by external or internal distractions.
7. Dhyana:
Meditation. Building upon  Dharana, the concentration is no longer focused on a single thing but is  all encompassing.
8. Samadhi:
Bliss.  Building upon Dhyana, the transcendence of the self through meditation.  The merging of the self with the universe. Sometimes translated as  enlightenment.