I've found this article from Runners World to be of great help as I've gradually introduced running back into my training, after injury caused by running. Check it out and add these routines to your training schedule, they really do help.
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So how do you get your inner core functioning properly? It starts with breathing. When you inhale using your diaphragm (allowing your rib cage to open to the sides and belly to expand) rather than just breathing using your chest, your pelvic floor and transverse abdominis muscles lengthen. When you exhale, your pelvic floor and transverse abdominis recoil. This generates deep tension in your torso—good tension that anchors your core and creates stability when you run. Wiebe’s strategy starts here, with exercises that teach you how to engage your inner core. Practicing them as regularly as possible will teach your body to actively recruit these muscles and connect them with the outer core, which will eventually carry over to your running.
https://www.runnersworld.com/the-body-shop/new-exercises-for-strengthening-your-core/slide/1