I believe in voice having a growing role in future of user interaction. This is an interesting concept, that I came across recently, and currently testing out.
I find myself always checking my phone display during runs to see my pace/time etc so i totally dig this concept. The voice recognition is just not there yet tho - took me several attempts to start a run or ask for weather forecasts
PageSpeed Ninja
FYTNS
Dreambase.ai
Runcast