Depends on their goals. For some people, I give them more advanced planks and/or add weight. For example: side plank on forearm --> side plank extended arm --> side plank extended arm with kettlebell/dumbbell.
Others move on to some specific ab/core exercises using flexion, rotation, etc. I'm always very careful to not let them use momentum or put the back at risk. But this is always part of a larger, overall package.
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