CORE

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Your Core Muscles - Deeper Than You Think - Yoga Anatomy

The Common Core Explained

What Are Core Muscles? The Role of Each Core Muscle and Best Exercises

Core

Strange twist: Earth's inner core may be changing its spin direction

Earth's inner core may have a whole other core inside it

Explained: Dynamo theory, MIT News

What are the Core Muscles?

A Closer Look at Mercury's Spin and Gravity Reveals the Planet's Inner Solid Core - NASA