I try to run at least 4 times for the week. I'm making the 1.5 mile in 10:20 and steadily dropping my time. Except yesterday my damned shins basically cramped up on me. I wasn't even running all that fast. The bone doesn't hurt, but the muscle that runs along the shin is really hard. I have fairly new Reebok running shoes. Anyone have an idead of what I'm doing wrong??