It’s a summer Sunday morning, the sky is clear and the sun has not yet reached its hottest point of the day.  People are walking their dogs, jogging, and crabbing along the Canton Waterfront in southeast Baltimore. Nearby on the grass, nearly 100 people have laid out yoga mats and have begun a harmonious flow, shifting and transitioning from mountain to cobra to down dog to warrior and back.  All ages participate, from kids to seniors, and sometimes a few dogs. A woman glides between them all, calling out poses and leading the sequence. The wind rustles the sycamore leaves and passers turn to watch and sometimes join in. It’s one of my favorite parts of summer - exercising my body and mind while connecting to the outdoors just a short walk from my home. This is Pop Up Yoga Baltimore, a pay-what-you-can yoga company that makes yoga accessible in parks around the city.