A plank position is part of a yoga/Pilates workout. The person supports the body on the floor in a prone position with the arms and feet supporting the body. It is a little like the "up" position of a push-up, held for 30 to 60 seconds. Contraction of the abdominal muscles in a plank is most likely

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In a plank position, the muscles are contracting isometrically, meaning the joint angle remains constant and there is no movement of the muscles. The contraction is sustained for a period of time, which leads to increased muscular endurance and core stability.

A Plank Position Is Part of a Yoga/Pilates Workout