If the watch is going to be used to track health stats then it sounds very sensible to do this in the firmware rather than with separate apps.
@johan_m_o started
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
If the watch is going to be used to track health stats then it sounds very sensible to do this in the firmware rather than with separate apps.