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Day one verdict: my lungs were fine, my shoes were not. They're about six years old and were bought for walking, not running. For those further along, did new shoes make a real difference, and did you get fitted somewhere or just buy what felt comfortable?
Doctor hat on for a second: worn-out shoes and doing too much too soon are the usual suspects behind sore shins, so I'm trying hard not to become my own cautionary tale.