1 ACCEPTED SOLUTION
Presuming you are able to log in to that new account, just open the activity at Strava.com using a web browser. Click the … menu, and you should be given the option to Export Original:
Save the file to your desktop. It will likely have the extension .FIT or .GPX.
Now log out of this new account, and log in to your regular account. You still have to use a web browser for this, not the Strava app. In the upper-right, next to your profile picture, hover the ⊕ to expand the menu, then click Upload Activity:
Click Choose Files, then select the file you downloaded in the previous step.
Presuming you are able to log in to that new account, just open the activity at Strava.com using a web browser. Click the … menu, and you should be given the option to Export Original:
Save the file to your desktop. It will likely have the extension .FIT or .GPX.
Now log out of this new account, and log in to your regular account. You still have to use a web browser for this, not the Strava app. In the upper-right, next to your profile picture, hover the ⊕ to expand the menu, then click Upload Activity:
Click Choose Files, then select the file you downloaded in the previous step.
