Planning a gluttonous holiday season and then a health kick in the New Year to balance it out? Well, when you start on the latter, you might want one of Zensorium's Tinké cardiorespiratory monitors to track your progress. The sensor is compatible with any of your old-fashioned 30-pin iOS devices (it'll work with the Lightning adapter, too), and with the press of a thumb, it can measure heart rate, blood oxygenation and respiratory rate using light. All this data is fed into the free companion app, which generates an overall fitness score called the "Vita Index" and logs it for later comparison. Stress levels can also be assessed, using fluctuations in your heart rate to score the "Zen Index." Sharing how unfit and stressed you are can be done via Facebook or Tinké's own network, which also allows you to compare results with other users worldwide. The monitor will set you back $119 and is available now from Zensorium in a choice of four colors.