Halle Berry Fitness Friday 5-Move Ab Workout Review
I Tried Halle Berry's Infamous Fitness Friday Core Workout, and My Abs Wouldn't Stop Shaking
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If high planks no longer challenge you, try the single-arm isolation plank. Come into a high plank position and lift one arm off of the ground. Hold for 30 to 60 seconds.
If this is too advanced, you can perform a high plank.