Delete mistaken exercise minutes from Apple Fitness

Is it true that if you accidently leave your watch running on an activity overnight, that the only way to get your data correct is to either restore your watch completely to a backup, or delete the individual minutes one by one (600 individual deletions for leaving my activity going overnight)?

That's incredibly bad for the user. How is it possible? Apple watch for someone who cares about their exercise data goes from a 5-star to a 2-star if its true. I won't be recommending it to others.