Plank

Plank — Start position — Start position

Plank — End position — End position

Region: Lumbar & Core
Equipment: Body Only
Category: Strength
Level: Beginner
Mechanic: isolation
Force: static

Muscles worked

abdominals

Filled = primary · Outlined = secondary

Source: Free Exercise DB (public domain)

How to perform

Get into a prone position on the floor, supporting your weight on your toes and your forearms. Your arms are bent and directly below the shoulder.
Keep your body straight at all times, and hold this position as long as possible. To increase difficulty, an arm or leg can be raised.

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