Cable rotations and Deadbugs are the most brutal ab exercises I do. You could do otehr targeted exercises, but these are simple and damaging, especially with the low-to-high cable rotation.  With the cable rotation make sure you don't cheat by using your arms, keep your core tight and twist.  https://www.youtube.com/watch?v=lBsKxP2Qstw The deadbug is freeweight and you push your core into the ground and move your legs. It is deceptively difficult. https://www.youtube.com/watch?v=I5xbsA71v1A Your running should be based on the calorie intake. It could be that a different exercise is better for cutting. If you enjoy running it may be easier to adapt. Regardless of of the information you receive make sure you find what works best for you and your body. You personally may wish to run shorter distances more often or drop intake a lot and run very little. Test and experiment.