WOW! The last few days about 10 min into my morning walk the muscle on my shin starts to tighten up and hurt like hell. After about another 5 minutes I have to stop and stretch. Its on the outside of the right leg I believe its called the anterior tibialis. Could it be walking on the pavement? I'm going to try the treadmill tomorrow and see if thats okay. I iced it for 20 min on and off a few times after I got back and the swelling and tightness went away. Could this be shin splints?