Before I moved the gym there had one and boy was it a butt kick! As to the calories, I'm not sure, it was before my BMF (Body Media Fit) and before I was religiously tracked calories burned. But if you have the opportunity, def try it out!
Today with my trainer I would alternate weight machines with 3 minutes on the Jacob's Ladder. It was SO HARD but a great workout. It was hard for me to get used to the JL at first, but now I would totally recommend it if you are looking for a one stop workout.
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