Tell your student what you plan to do, as you ask for permission to make a physical adjustment. It goes without saying that you should keep your hands off private spaces and keep your private spaces off your students. Now you may ask: "How can I make a physical adjustment in Half Moon Pose - (Ardha Chandrasana), without getting real close?"
Firstly, demonstrate all or part of a new Vinyasa sequence, so your students have a visual interpretation within their minds. You could start your sequencing with slow deliberate movements - with emphasis on form. As the class continues, you could gradually, and safely, increase the speed by requiring less time for your students to hold the postures, but still mention the importance of good form and proper alignment.
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