So, I'm back on my bike after a break of about 5 years. It's a decent-ish bike, a Giant OCR4 that I used for a triathlon back in 2007. Since then I've had 2 back injuries, the most recent culminating in surgery last October. As of a couple of weeks ago I'm back on the bike, and I want to make sure that I stay there (not literally, I can cope with that bit). I'm aware that this is a common question, but I may be asking it in a slightly different way. I want to join a club to help keep me motivated, but I don't want to join one too soon & have the opposite effect. Referring back to the title of this thread, I'm currently covering a loop of about 6 miles at an average speed of between 12-13mph. The punchline - my question is, am I better off concentrating on building up mileage first, or should I be working on improving my average speed over the shorter distance (please God don't say both..)? Thanks in advance..