By Jeff PattersonStaff writerjpatterson@oklahoman.comIf you’re looking for a fight on the south side of Oklahoma City, just stroll down the alley behind 25th and Hudson and look for the first open door. Walk in and you’ll be greeted with a steep climb to the top, which is fitting for a sport where nothing comes easy. There’s no heating or cooling at Rival Boxing Gym, and that’s just the way they like it.Read more on NewsOK.com