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The core constitutes the musculature surrounding the trunk: front, sides and back. It provides a foundation on which almost all gross motor (large action) movements are based. The stronger and more stable your core, the more force the limbs can produce. Any closed-chain movement (hands or feet remaining in a fixed position) will automatically activate the core to stabilise the trunk.

Add resistance and the effect is magnified. In your case you're doing enough to maintain a strong and healthy core.

Adding extra core exercises should be determined by your own goals, remembering that any strengthening movement will result in some structural adaptation (ie, an increase in size).