Q: Fall detector for iWatch, is there one.  If not I would like to make one (I'm an IT grad student).  Can anyone help

All the elements exist for an app for persons with health issues:

1.  Watch can sense rapid change in position such as a fall.

2.  Watch can sense extended little to no movement after fall.

3.  Watch has ability to monitor heart rate.

4.  Watch has ability to make and receive phone calls from iPhone, provided phone is nearby.