Sit-ups are probably the most famous core exercise in the world, but there are plenty of other ways to work your mid-body muscles. If you're looking for alternatives, try this comprehensive core workout from fitness trainer James Stirling (AKA the London Fitness Guy).
It includes six equipment-free moves: bird dogs, hollow rocks, shoulder taps, hip dips, reverse crunches and single-leg jacks. These moves can be added into your usual workout or combined into a circuit for a standalone core session.
