For those who are into things like this, did you see that the new Garmin Running Power capability (like Stryd) is coming to the VA3, by virtue of the fact that the VA3 has a barometric altimeter in it.... You'd need either an HRM-TRI or similar strap, or a Running-Dynamics Foot Pod, and once the app or whatever (see video) comes out in November, all your running power dreams will come true:
https://www.youtube.com/watch?v=R7sDY63H8_Y&t=190s