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I use this: http://i50.tinypic.com/353cz6e.jpg Intensity guidelines are: If you can hold a normal conversation during the activity, it's LOW. If you take a deep breath between sentences, it's MEDIUM. If you breathe between words or short phrases, it's HIGH. If you can barely speak, it's VERY HIGH. You cannot sustain 'Very…
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HAHA - you should ask Edgar about the mathematical proof I emailed him on the subject! I don't think he likes me right now :P