Running Shoes

With 8 weeks to go for my running in the Yonkers Marathon, I'm thinking about getting a new pairs of sneakers. I like the ones I have now. They are light and I've had good results in my races this year with them. But the soles of the the running shoes are very firm and I'm thinking I need more flexibility for my heels. I have seen a pair of sneakers at the sporting goods store that I really like so if they have it in my size then I might just get them.