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According to the official site at https://actifit.io

  1. Download the Actifit mobile app.
  2. Go for a jog, walk your dog, mow your lawn, go to the gym, move around your office,... with an aim to reach a minimum of 5,000 activity count.
  3. Post a report via the app, and get rewarded!

TLDR: Get 5000 activity count then post using the app with your username and private posting key.

Thanks 🙌