Running in Beijing, China: Best Routes and Places to Run in Beijing (greatruns.com) has insights: “Beijing has an extensive public transportation system, consisting of buses and inexpensive subways, with English language signage. Runners should note Beijing’s climate: cold winters and hot, humid summers. The city is famous for its cherry blossoms in spring and gorgeous fall foliage in the parks.”

The Top 5 Running Spots in Beijing by a foreigner has personal insights.

• 紫竹院 .. featured in numerous lists
• 玉渊潭 .. featured in numerous lists
• 朝阳公园 .. featured in numerous lists, popular with expats but a bit far for me
• 天坛 .. featured in multiple lists
• TsingHua .. featured in multiple lists
• 陶然亭 .. subway access