At my gym there is this rather intimidating machine that sits in the corner, it is the worst of all the machines in the gym and has the potential to make you sweat more than any other, this one will tell you your weight, BMI and fat mass! I have only ever seen one person on it, and that was a P.T. this is probably because no one wants to be weighed in a gym full of people, but I have always been curious about the result.