Story, photos by Cassie Hepler Imagine a world with no rock climbing gyms. Well, that used to exist. But in Philly, we are luckily spoiled. Founded in 1994, the first Philadelphia Rock Gym was built by two college friends, Greg and Matt, who had a vision to bring their passion and enthusiasm for climbing back to their hometown and to make a living doing what they loved. By taking the smart step of bringing climbing inside and available rain, snow or sunshine, they became one of the first indoor climbing centers in the U.S. Now these guys dominate Philadelphia and the suburbs with rock climbing gyms in East Falls, Oaks, Coatesville…