Yesterday, my office held a health fair. I went to get my body fat percentage measured. The technician asks me for my age (32), my height (5’10") and my weight (152). Then I grasp 2 handles on a device which spits out my body fat percentage (12%). A couple of people comment on how good that is, and I must admit that I’m feeling pretty proud.
Then I think to myself: “How did that device read all the fat throughout my body simply by me grasping the handles?” Was I duped? Did the age, height and weight answers imply my body fat %-age? Or did grasping the handles really do something magical? And how?