Share ideas 😎

I come from a legal background, not the most creative in this subgroup. Would love to see how people envision the below App idea 🙏

Task:

To create a competitive group based fitness challenge app amongst friends. Set duration, set competitive activity of groups choice. Winner wins a crypto/cash price.

Food for thought:

Which style of the following would you use? - theme - fonts - dashboard - payment interface - leaderboard - social interactions - gps tracker (for running etc)

Which other ideas come to mind? How do you balance between a fun interactive, competitive, but yet sleek modern app approach?

Thank you creatives!