Hello @Msimpson and welcome aboard to our community. Note that so far is not possible to edit the details of your exercise tracked. But you can manually log this information where you are able to enter how much distance you did or the intensity during the exercise. For this you can take a look at this article: How do I manually log or record an activity?.
Also you can share your suggestions in our Feature Requests, there are some user that have post the same idea, to give you an example you can visit this post here. You can vote for this idea and add your comments. The product team looks forward to reading and incorporating your suggestions into future versions of Fitbit trackers and apps.
Hope this advice be of your help, see ya around.
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