Originally Posted by
bigbenaugust
I don't know... ride 10 miles of rough road a day and it will probably do wonders for your bone density.

I'm waiting for the snow to melt so I can resume riding these to work. Maybe they'll be clear by Monday.
Back to the topic, in winter, my commute is the extent of my exercise. In the three seasons, besides being able to ride longer, more interesting routes to work, I add both solo and group rides on a couple of weeknights and on the weekend