Impact Loading Rate will only be available if your activity was sourced from one of these devices:
Garmin watch (using Stryd Zones data field or the Stryd Workout App)
Apple Watch (using the Stryd app)
iPhone/Android (using the Stryd app)
Offline sync between Stryd and your phone (offline sync or merged data after initially syncing your Suunto or Polar watch)
If you are not seeing Impact Loading Rate, be sure that you meet the following requirements:
You are running with the next gen Stryd pod
Your next gen Stryd has the latest firmware update (>2.1.29)
You are using the latest version of the Stryd app you are recording with or offline syncing with (iPhone, Android, Apple Watch, Connect IQ app/datafield on your Garmin watch)
Note: Impact Loading Rate recording is not yet supported for COROS watches