Runna workouts, Garmin and treadmill accuracy
Structured treadmill sessions expose a measurement problem that is easy to miss during a steady run: the workout target may live on Garmin, while the treadmill controls the speed, and the watch still has to estimate indoor pace without GPS.
RunBridge is independently developed and is not affiliated with or endorsed by Runna or Garmin.
What happens during an indoor structured workout
When a Runna plan is synced to Garmin, the watch can guide the workout's steps and targets. The treadmill still sets the belt speed. If Garmin relies on wrist-based indoor estimates, its live pace and distance can lag or differ from the treadmill—particularly through short intervals and recoveries.
Post-run treadmill calibration may improve the final distance, but it does not necessarily make the live pace prompt follow every belt-speed change.
Where RunBridge fits
On a compatible FTMS treadmill, RunBridge relays the treadmill-reported speed and distance to Garmin through a familiar running-sensor profile. The watch continues to run the structured workout; RunBridge supplies a different source for the running data.
That can make the numbers on Garmin better match the treadmill used to control the workout. It does not guarantee the treadmill's physical belt speed is perfectly calibrated, and it does not create or modify the Runna workout.
Check before buying
- Look for your model in the RunBridge compatibility list.
- If it is not listed, test it with RunBridge Companion.
- If compatible, follow the quick start guide to connect the treadmill and Garmin sides.
For a deeper explanation of the underlying measurement problem, read Garmin treadmill pace and distance accuracy.