My post from my MS blog:
First Training Ride of the Year
My first training ride for 2008 was a 100 KM trip from Audubon, PA, to Philadelphia and back, with some additional riding to reach the century mark. My average speed was a bit over 11 MPH. I was very sore afterwards, particularly my, ahem, posterior. It was a little early in the season to tackle such a long ride.