The 21K CDMX is Mexico City’s official half marathon, attracting thousands of runners annually. It is known for excellent organization, strong community support, and a scenic route through historic and modern parts of the city.
             
           
                
                    Course Terrain 
                
                
                    The route is mostly flat with some mild elevations, primarily on paved city streets. The course starts and finishes in iconic places like Reforma and passes through Chapultepec Park.
                 
            
            
                
                    Elevation Changes 
                
                
                    Mild elevation changes with a few gradual inclines, mostly flat and considered beginner-friendly.