Nobody wants his or her personal trainer around all the time. But constant monitoring, as in 24-by-7, may be what it takes to be an elite athlete, or to improve your health and fitness. At Demo, a company called BodyMedia introduced a "pro" version of its monitoring system. When you're wearing an armband or patch, pictured here, BodyMedia's system tracks calories burned, activity, and sleep patterns. Once your data is loaded into BodyMedia's new ProConnect app, it's available to your trainer and coach anytime, anywhere.