If you forget to stop the watch at the end of an activity, how do you edit and delete the data to cut out an unwanted segment. Such as the recording of a car journey after the run for example.

Forerunner 55 - new user. 

Is there a way to edit the actual data record? For example to delete the last 10 mins of the recording? 

If you switch on for a run but forget to switch off until halfway home in the car.

Thanks