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Since 10-16 months, I used to get a pulling sensation in the back of one of my thighs when beginning to run, which would usually go away or substantially lighten during the run. Until the next morning, when it would be almost impossible to properly stretch my leg. So, I increased stretching exercises directly after running to about 15mins. Sometimes it makes it a bit better, sometimes it doesn't.
Call me stupid, but I always thought running was ok because it didn't hurt while running. It took me this long to google and figure out that it's very likely to be a hamstring injury, and that these injuries would specifically not hurt during exercise due to the better blood circulation. Duh. No idea where and when I got this from. Anyway, I guess I'd better give it a proper rest now.
I think I really need to keep at least a bit active though. What sports or exercise would you suggest that don't put any strain on the hamstring? Currently, I can't do anything without a warm up - the other day, I limped to catch my bus when attempting to run, and I get the same pulling sensation (though not pain, usually) even when getting up from my desk after a while of working.