Hi Doctor, I am hailing from Chennai, near by my house there is a Park which consists of hard surface walking. I went for a week there and I developed a leg strain. I thought it was my shoes that was not proper. Then I realized that the shoes were proper because I walked in the roads of Chennai. It was smooth. My question is on what surface should I walk. Because practically in Chennai all the parks consists of Hard surfaces. Please advice me on this? Thanks