At some point your abs won’t be challenged hard with normal planks. There are a ton of plank variations, but this is one I’ve never used: Jumping Jack Planks.
Here is a version where you just use your legs.

Here’s one that uses arms and legs (more advanced).

I think I will add this exercise to at least one of my ab workouts each week. Without even doing these I can see how they would increase definition and density.
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