Hi ​@Faz16, if there's a specific activity that's unrealistic, it can be flagged from the Strava website (not from the mobile app I’m afraid). Or, if the activity isn't visible, or there's another reason why the flagging isn't suitable, you can also report the user to the Support team; both options are described here:

https://support.strava.com/hc/en-us/articles/206522304-How-to-Report-Cheating-on-Strava

(Just note, it seems that the support tickets have longer than usual response time these days, so it may take a while.)

Thanks ​@Jana_S  . Unfortunately the accounts are private, so it’s not possible to view & report any specific sectors. 
 

Seems you can report a user, but you can’t give any specific details as to why. 

In such scenarios, I suppose that the support ticket is the only option.

Anyway, I’m surprised that there's no automation in place to automatically flag accounts with more than 24h of activity per day...

You’d think, wouldn’t you? 😳

I found the same issue with the May 2025 400 Minute Challenge, where the top 50 had recorded more hours activity than there were hours in the month.

After some digging through their activities (at least for the publicly visible accounts), it appears that going swimming with a Suunto watch causes the occasional erroneous lap time of between 590 and 600 hours. Go for a couple of swims, or a long enough swim to trigger the issue more than once, and you can easily rack up over 1000 hours.