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I created this exercise back when David first invented the BOSU Ball and I had two of his early prototypes.  I was competing in half-marathons at that time and this exercise was responsible for significant improvements in my minute-per-mile times.  I would use "the Runner" as a warm-up prior to going out for my road work.  Only about 3-5 minutes at a time - which is more work than you might think.  The efficiency of my running stride increased and my times dropped.  I love this exercise!