I would just like to add that in addition to leg exercises, moves that work the core and hips are beneficial for runners. All kinds of front planks, side planks, and bridges, and even pushups will help runners with hills and gait. Running is a full body activity, and keeping the core and hips strong will help prevent injury and reduce fatigue. For additional leg exercises, single leg exercises also work well. Bulgarian split squats and single leg deadlifts help activate glute muscles.
Hope this helps!