Develop Strength Down to the Core

A simple way to activate your core is to hold yourself up when you exercise—no irony intended.

 

Consider the egg—a raw one may have a hard exterior but we all know what happens when the outer shell is compromised. Unless we reinforce the inside first, by cooking it, an egg might look hard and solid when, in fact, it's fragile and falls over when we try to stand it up. A hard-boiled egg, on the other hand, can be spun on its head.

 

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from Breaking Muscle https://ift.tt/2I8oWzy