This is exactly the issue with what people think about running/walking and how people execute their motion. You can make any exercise a core strength exercise.

This is exactly the issue with what people think about running/walking and how people execute their motion. You can make any exercise a core strength exercise. I run and walk from my çore, I perform all motion from my core. This is a feeling and skill you learn from taijiquan and it is applicable to any type of exercise.