Fitness exhibitionism is nothing new. MTV yoked its arrival in 1983 when it rode a lusty Olivia Newton John video for Physical to a Grammy award. Hollywood's A-list followed in 1985's Perfect, with John Travolta and Jamie Lee Curtis starring in one of the 100 most enjoyable bad movies ever made. Thirty years and several tons of unwanted national poundage later, we find social media conspiring with wearable fitness devices to create the conditions for data voyeurism. This desire to have a deeper view into one's own body — while simultaneously being seen — has set the stage for an unprecedented explosion of digital narcissism, ripe for corporate exploitation.

Sporting goods companies like Adidas and Nike were first to heed the call. The Nike+ ecosystem of devices, services, and apps, in particular, including the recently launched FuelBand we reviewed last month, is leading the way. Newcomers like Jawbone tried and failed to upset the incumbents with the bungled launch of the Up fitness band. That leaves Fitbit as one of the best threats to unseat the establishment with its well-received Fitbit Ultra wireless activity and sleep tracker I reviewed back in October. A position fortified by today's retail debut of the company's Fitbit Aria Wi-Fi scale.

As you'd expect, the Aria scale takes advantage of its Wi-Fi connection to automatically send your weight (in pounds, kilograms, or stones) to the tracking site each time you or another family member steps onto the device. But unlike most scales, Aria also measures and tracks your Body Mass Index (BMI) and even your body fat percentage — the latter achieved by coursing a small electrical current through your body. And like the Fitbit Ultra, the company motivates healthy behavior by rewarding owners with software badges when they reach weight goals or demonstrate healthy behavior. Personal health data can even be shared with friends or like-minded members of the Fitbit community. But can any scale, even one this advanced, really be worth $129.95 to anyone but the self-obsessed?