Perfection in an asana is achieved when the effort to perform it becomes effortless and when the inner infinite being is reached
YOGA SUTRAS DE PATANJALI
ASANAS
UTTHISTHA STHITI : STANDING ASANAS
UPAVISTHA STHITI : SEATED ASANAS
PACHIMA PRATANA STHITI : FORWARD EXTENSIONS ASANAS
PARVRITTA STHITI : LATERAL EXTENSIONS ASANAS
VIPARITA STHITI : INVERSIONS
PURVA PRATANA STHITI : BACKWARD EXTENSIONS ASANAS
HASTA TOLANA STHITI :ARM BALANCING ASANAS
SUPTA STHITI : SUPINE ASANAS
UDARA AKUNCHANA STHITI : ABDOMINAL CONTRACTION ASANAS
GRATHANA STHITI : KNOTTING ASANAS
VISRANTA KARAKA ASANA : RESTORATIVE AND SUPPORTED ASANAS
PRANAYAMA
Pranayama destroys the veil that covers the light of knowledge.
Yoga Sutras de Patanjali, II, 52