One great alternative to sit-ups and crunches is the*Turkish get-up.
The Turkish get-up is a perfect blend of mobility, stability, functional movement, proprioception and core strength.
The abundance of moving parts in this exercise provides a great stimulus for the core, as well as other strength and movement benefits.
If you want to feel your abs burn, do some heavy get-ups with a weight that is heavy enough to activate the deep muscles of your core

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