Poznan and the 21 day challenge

I have just read that you have to do something for 21 consecutive days for it to become habit so from Saturday morning I plan to get out of bed and ride my bike every day for 21 days and see how that works out.
In the meantime, here is a picture of Poznan, I will be here for the next 24 hours, my first impressions are that it is nicer than Warsaw, but that doesn't mean much.