yoga by defiinition means union. Union between mind and body union between eathr and spirit union between any force in the universe
yoga originally consisted of 1 posture lotus posture with Ujjayi breath and the focus of being thoughtless but mindful. Something not easily understood in the west
Asana is the physical pose down dog updog crow plow utkatsana this is the use of Ujjayi breath or Prana to guide the body through a moving meditation
please spread the word of meditation to your students it is missed in almost every yoga class in the west and needs to be taught and practiced amongst teachers