Jawbone had big plans for its UP3 fitness tracker. When it was first announced, Jawbone was happy to boast that the UP3 would be the first 24/7 tracker you could use to not only track your steps throughout the day, but also track your laps while swimming.But it turns out that Jawbone's eagerness to create an all-encompassing tracking device were not to be. As production scaled up, the company couldn't actually deliver on its claims the device was waterproof.So, after a long, hard look at the product, the UP3 that's now hitting shelves around the world is not exactly the product we were promised last year.It is, however, a rather solid step up from its predecessor, the UP24. While that particular model has itself been replaced by the UP2, the UP3 brings with it the inclusion of a heart rate sensor, skin and ambient temperature sensors, and galvanic skin response measurements.The idea is that by including all the extra sensors, Jawbone is able to record even more data points, giving it more ways to inspire you to keep healthy.Interestingly though, many of those sensors aren't actually being translated into useful data yet.