seen from United States
seen from Malaysia

seen from Spain

seen from Germany

seen from Russia

seen from Malaysia
seen from United Kingdom
seen from Taiwan

seen from Italy
seen from T1
seen from China

seen from Germany

seen from Germany
seen from China
seen from Singapore
seen from China

seen from Türkiye
seen from China

seen from United States
seen from T1
Usability Testing Analysis
The single menu button from which the navigation pops up was the most problematic thing that came up during my usability testing. What started out as a relatively arbitrary decision ended up a two solutions: either do away with the pop-up nav and have all items on screen all the time, or have a tutorial explaining how the use the app when it is first downloaded (if a tutorial is needed, a link to it should probably go in the settings, just to have as reference). There was also some very small text that needs to be resolved. More icons to differentiate the pages with similar structures was also a suggestion I received.
The other issues were more conceptual: what is the difference between activity and challenges? And how to keep people accountable (not cheating) when logging activity? Possibly limit the number of challenges a person can do per week.
Some wire frames.
Tentative sitemap.