I'm fairly new to running & run about 5k 4 times a week. About 2 months ago I started to get a pain in my right calf, right round to the front where the muscle joins the shin, which felt a little like I might have over stretched the muscle, and it's slowly built up so that now it's giving me quite a bit of trouble. It's fine about 10 minutes into a run but the rest of the time, when walking or just sitting about, it's really stiff & quite painful. Any ideas? I'm starting to train for my first 10k but don't want to do any more damage.