The engagement score is the measure of how active you are within the KrowdFit app over a 30 day period. Each box represents a day from today on the right to 30 days ago on the left. 

The green boxes indicate your device days. If you have a fitness tracker connected to KrowdFit this part should handle itself. Some devices require you to sync your tracker to your phone manually but then they send us the data. Most members will see a consistent trend on the green line. We use your data days to generate your Wellness Score. 

The purple boxes indicate the number of days you've logged into KrowdFit. When the two of these happen on the same day you get one point toward your engagement score. We then use your engagement score to start your level progression.