Scales don't lie, but stepping on one doesn't tell you the whole truth about the condition of your body. For a more accurate assessment, you'll need this Body Check Ball to demonstrate to you in no uncertain terms the wages of your slothful sins.
Hold it in both hands, and it sends a weak current through you, measuring body fat, bone density and percentage of muscle. Then you can read 'em and weep on its LCD screen, tracking your progress — or lack thereof — from day to day.
Is this one of those devices that gives you too much information? Depending on your degree of fitness, that knowledge could be $39 worth of bragging rights or shame.