How to exercise your core at home away from the gym?

How do I improve my core at home? I've been working out for a few weeks [2-3 times a week] I'm starting to see progress but how can I work on my core at home? I don't really have any workout equipment other than an incline for sit-ups, is there any other exercise I can do to improve my core by the way I do core In the gym every few days but yeah, thanks
How to exercise your core at home away from the gym?
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