Question regarding Calories Burned during T'ai Chi

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Hello Everyone!
First time posting in this Forum. I'm wanting to know, how many calories are burned during a 60 min session of T'ai Chi for Beginners? I start this new-to-me-dvd called: T'ai Chi Beginning Practice with David-Dorian Ross. My current weight is 310lbs & I want to make sure I'm getting the right amount of calories burned.
Thanks so much for your time, it's GREATLY appreciated!:smile:
WitchyOne aka Tiff