Severe tension when running.
I get severe muscle tensions in my calf and shin, I run a good pace about 6-7mph, on a track. After about 1/2 mile my calf muscles are rock hard, swollen to a huge size, extremely painful shin splints too, so bad it just literally hurts too much to run any farther, I stretch twice a day, really good deep stretches and they don't seem to do anything to help. I have no idea what is wrong, or what I could possibly be doing wrong. It's been like this for two weeks now, and it seems to be happening sooner in the run as well. Any ideas?