Stryd measures what a runner is actually producing, not what the terrain is letting them show. Pace lies on a climb and in a headwind. Power does not.
There is nothing to connect
This is the part people expect to be harder than it is. The power numbers travel along inside the file your watch records, so by the time the workout reaches Coachbox they are already in it. No account to link, no separate sync, no upload.
Pair the pod with the watch, run, and the power curve is on the workout when you open it.
What you can do with it
Plan sessions against running power the same way a cycling coach plans against watts. Set the running power zones for your athlete, build the intervals with power targets, and compare what they held against what you asked for.
For runners with a power source, Coachbox measures efficiency by comparing pace against heart rate rather than power against heart rate. For running, that is the pairing that actually says something.
