You are right, it tracks your steps for two weeks after you sign up for it and then determines an average, sadly I had 10,000 and I used to reach it for almost every biweekly challenge, but now its escalated to 14,600 which is hard to reach 10 days out of 14. maybe it will be lowered again since I am missing more days then hitting the goal.
One huge benefit of this app is to keep your Aeroplan account active, if you choose Aeroplan miles as your rewards then you can easily keep your account active and you can easily switch between Scene card , Aeroplan and Petro points. I am getting quite a bit of Scene points so "happy dance" :cheer2: