Does the Power Balance Wrist Band Work?: ESPN's Outside the Lines investigates whether the Power Balance Wrist Band, a band with a Mylar hologram to "optimize energy flow," actually improves an athlete's endurance, flexibility, strength and balance as advertised. More than $17 million was made last year selling the bands, which are being endorsed and worn by Shaquille O'Neal and other athletes. Exercise physiologists at the University of Wisconsin-Lacrosse tested the $30 bands against a 30 cent rubber wrist band on 20 student athletes. I think you know where this is going.