In reply to earlsdonwhu:
Reads more of a femoral or associated nerve problem/irritation in the thigh itself rather than from the back but it's very difficult to diagnose this over the net. But if it was back or joint related you would expect the running or cycling to also aggravate it. If you don't get any back problems you could try massage and stretching the relevant areas of the thigh eg quads or groin, otherwise frequency of training and the types of moves that aggravate it are worth considering and modifying. The sensible thing to do would be to get it checked out by a decent physio.