Under Armour has been slowly building a fitness empire. They absorbed the MapMyRun suite of apps, Endomondo, and MyFitnessPal, but software was only phase one. Now they’ve made the leap from software to hardware, debuting a fitness tracker, heart rate monitor, connected scale and more, all bundled and sold as “Under Armour Healthbox“, and designed through a partnership with HTC. The UA Band looks suspiciously similar to the HTC Grip tracker that was announced but never released, but with a slightly different feature set. There’s no GPS on board, but it tracks steps, sleep, prompts you to move, picks up…