exercise data no longer accurate after OS4.1 Update

Hi

If, under watchOS 4.x, your exercise levels are unchanged, but your Activity app estimations have changed significantly, then the following steps may help:

Check your personal information:

• Actiivity-related estimations depend, in part, on your personal information. To check that this is accurate:
  • On your iPhone, in the Watch app, go to: My Watch (tab) > Health > Edit - tap and adjust items, then tap on Done.

Check your Location Services settings:

• On your iPhone, go to: Settings > Privacy > Location Services:
  • Check that Location Services (the main setting at the top) is turned on.
  • In the list of apps beneath, check that Apple Watch Workout and Nike+ Run Club are set to While Using.
  • Also enable options under System Services including Motion Calibration & Distance, Wi-Fi Networking and Mobile Network Search.

Reset your existing calibration data and recalibrate your Apple Watch:

• Calibration can improve the accuracy of estimations made by Activity app and Workout app.
• More information and instructions are available via the link below:
  • Calibrating your Apple Watch for improved Workout and Activity accuracy - Apple Support
• Resetting your calibration data can be equally as helpful for Series 2 & 3 models and will not erase your Activity history.

Check that you are wearing your Apple Watch sufficiently snugly on the top of your wrist:

• If your Apple Watch is worn too loosely, it can believe that it has been removed, causing activity to not be tracked.
• For the best performance from your Apple Watch - including the most accurate readings from the heart rate sensor, which is used continually during workouts - be sure to wear your Apple Watch snugly (but not too tightly) during your workouts.
• Apple suggests tightening your Apple Watch band before workouts and loosening it again afterwards:
  • Wearing your Apple Watch - Apple Support

More information:

Use the Activity app on your Apple Watch - Apple Support

Work out with your Apple Watch - Apple Support

Your heart rate. What it means, and where on Apple Watch you’ll find it. - Apple Support