First of all 100 km is goal for a month in total not for stright run/jog. The longest distans I covered in one run was marathon (42194m), I did it twice, but it was 10 years ago.

To be honest I am too lazy to make proper streaching and mobility exercises pre and post jog. I do just a few of them. But from time I combined jogging with gym exercises I seen the diference and more comfort during run. The exercises are simple i.e. burpees, sit-ups, push-ups.