A public and free thing one sees all over the city are these outdoor gyms. There's even a mini version on the sidewalk near our apartment. This one is just underneath our office building and is well used inside of Tuanjiehu Park. But they are all over, squeezed into space wherever.
Finally, this is the river, aka mosquito breeding ground, next to the 4th Ring Road just south of Chaoyang Park. You can also see how smoggy that day was. It's right next to the huge apartment complex called Park Avenue which is next to the one called Palm Springs. I didn't even look at apartments at these two complexes mostly because they were too large but also because of their names.