Withings was one of a pretty busy section of the CES 2013 show floor demoing health, fitness and lifestyle monitoring apps, and it had a couple of new things to add to its line of Wi-Fi scales and monitoring devices. One was the new Withings Smart Body Analyzer, which is a version of its Wi-Fi scale that, for the first time, measures heart rate. The other was the Smart Activity Tracker, a FitBit-style device for keeping track of your activity.