Who "new"?

My loving support crew bestowed me with new kicks this holiday season and wouldn't you know it had me running circles of happiness. Lately, my hamstrings have been bothering me and I thought it might be overuse, possibly the three runs in November? I still kept running and just made sure I stretched. Well wouldn't you know, after getting the new shoes my legs feel SOOO much better. I've heard people say new shoes are important but feeling is believing to this Thomas. Although, I don't think that it was necessarily that I didn't "believe" but more, I can be lazy replacing things like running shoes sometimes.