Fundamentals! If your students don't know how to kick the bag properly, they are never going to find their range and hit a moving target. Not to mention the increased chance of foot or ankle injury if they aren't making contact correctly.
It should be your goal to create lifelong students that have a passion for their art and are healthy enough to withstand years of training.
https://www.youtube.com/watch?v=d89HMqlxJ9g
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