"Rectify an activity" is a very cool features in Garmin Connect that appears recently. It is well working on running, hiking activites as well as the speed color track on the map but why these 2 features are not available for other activities like skiing for example. It happens for all activities to forget to stop the watch ... As a consequence I had to change the activity ski to hike to modify it and then remodify from hike to ski ...
