Why is the body fat % on my new Garmin Index S2 scale way off? I'm 6 ft tall, waist measurement is 37", hips me as measurement is 40". My brother says I'm built like a free safety in the NFL. I ran 3.5 miles yesterday and 5 miles the day before that with a shoulder and ab workout. Does this sound like a person who is overweight, bordering on obese, according to body fat % charts?