I'm feeling quite proud of myself this week, when I reflect on my arse-related commitments.Bike-riding: To work four times, and back again three times. Excuse? Hellacious weather. It is not an exaggeration. Trust me when I say that I have been blown on to the wrong side of the road, into the path of oncoming traffic. Cigarettes: 1. Soft-shoe shuffle!Yoga: two classes. One under par, but in