During teacher training sessions, experience had been that a 30-minute yoga session with 3 yoga postures at a time should have the three stages, i.e., demonstration-cum-explanation stage; guided practice stage; and individual practice phase.
The proper conduct of yoga sessions makes students self-regulated and self-disciplined, it has been found.
It has been rightly said by many wise teachers that there are no problem-children; rather, there are problem-teachers in schools that don't teach students in self-development and self-management skills but tend to drive students through punishment.
Unfortunately, bad teachers use ear-holding and murga posture as punishment tools for shaming and torturing students in many South-Asian countries by making students to stay in that posture for very long periods causing almost unbearable pain.
In fact, ear(s) holding/pulling and murga posture when done in a child-friendly social environment by a wise-teacher for a time-interval of 10 breaths; they are great cross-lateral exercises for hemispheric integration of the brain. Some studies suggest that cross-lateral exercises even improve academic skills due to improved coordination through 'brain education'.
Moreover, yoga practice should be child-centric since there is diversity among children in terms their age, abilities and nature. There is a need to make a paradigm shift from the yoga-centricity of the child to the child-centricity of the yoga, I strongly feel.