Most adults don't sing anymore. We have to break that, and start singing the name of the Almighty One, try to cultivate the emotions. We have to elevate our emotions to the maximum, to the limit, and that then turns into spiritual bliss.
Everything depends on your mental attitude.
Don't teach too many postures; just the main ones, and hold them for a long time.
Let the skin be like water, let the flesh hang from the bones.
The Spiritual Sun already blazes within.
There is a time to be still in the pose.