There are two longer distance trails in the Yubei District that are terrific for running. They are paved multi-use trails with rolling hill terrain. It is difficult to map them specifically as they are new and constantly evolving, plus there are no digital maps of these trails and they do not show up on traditional mapping apps in their entirety. So, use this as a guideline, and obtain more specific, updated information when in Chongqing. Note also things change quickly in Chongqing!  

Lijia Neighborhood Trails

Yubei District. 15.5 km trail, suitable for running. According to iChongqing: It consists of the mainline of the Lijia Smart City Trail and three branches of Baiyunshan Park Trail, Hongyazhai Park Trail, and Lijia Center Trail. More details in this article from iChongqing. 

AVIC Town Park

AVIC Town Park
AVIC Town Park. chan9e.cn/en

Located in Longxing Zhonghang Town (Longxingzhen) in the Yubei District, these are paved, 3k, 5k, & 10k running trails. The different trails are color-coded and have motivational themes along them. The terrain is rolling hills, with lovely flora and fauna, and a landscape that combines open & forest, with a couple of lakes. Additional information in this article.