Having six-pack abs would be nice, but a washboard tummy doesn’t always equate to a strong core — and a strong core is what’s important for overall health and fitness.
This routine is entirely isometric, meaning you contract your muscles without actually moving them. Think of it as resisting movement instead of creating movement.
You’re probably already familiar with one of the best isometric exercises for core strength: the plank. You’ll perform planks and more ab-burning holds in the quick workout below.
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