Back After 6 Weeks. Still with Lower-back Pain.

After nearly spending 3 weeks in London/Nottingham on a business trip and nursing a nagging lower-back pain after returning for nearly another 3 weeks, I finally got back on the saddle and rode solo to Back Bay this morning.   My cardiac fitness had suffered from the lack training.  I worked too hard to finish the 30.8-mile ride with an 15.8 MPH average speed and 161 BMP average heart rate.  I was riding above my threshold for more than half of time trying to hold on.  Sigh.