Group Activities

This is an automatic feature that detects if you recorded an activity at the same time as other users, and on the same route. When we detect this, your activity becomes linked to any matching group activities and we display the group activity differently in your Dashboard Feed. When viewing an activity details page on either the website or from the mobile apps, you will also be able to see those other users detected as "also on this Ride/Run".

How Group Activity Detection Works:

In order to be detected as a group activity, our algorithm considers the percentage of elapsed time in your activity that the other activity is 'nearby.'  If the other activity is nearby for more than 30% of the time, it is considered a match.  This threshold allows for other users to join a group ride or run mid-way through, or leave early as long as they match the set percentage. 

Technical notes on the implementation:
- The new algorithm is asymmetric. For example if you join someone for the last 5 miles of their 50 mile ride, it will say that you rode with them, but not that they rode with you. In most cases however matching is symmetric.
- The new algorithm is activity type agnostic (for example ski can be matched with snowboard).
- 'Nearby' means closer than a few hundred meters together, however this rule is more flexible for longer distance activities.
You can remove an athlete from a Group Activity from the web version of Strava. If you access the Other Athletes lightbox from your own activity you will see the option to remove 'Remove Athlete.' The athlete who you remove will no longer see you grouped on their activity. Be aware that if you are looking at the activity belonging to another athlete with whom you are grouped, you won't see the option to remove yourself the from the Group Activity. 

Troubleshooting Group Activities:

Timing: If you are having trouble matching to your group activities and you are a Strava mobile App user, try checking your device's internal clock settings. If you set your phone's clock manually, your set time could be over 1 minute off from the automatic clock from cell towers/satellites causing you to miss the group activity detection. Instead, try setting your clock to update automatically. 




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