Build genuine serratus anterior strength and active scapular control with this quadruped protraction isometric — the more accessible version of the plank scapular protraction drill, delivering the same targeted stimulus to the scapulae and serratus anterior in a position that is easier to sustain, easier to control, and easier to keep honest.

In a standard quadruped position with the core engaged and the spine neutral, the task is identical to the plank version — push both scapulae into full protraction, gliding them around the ribcage away from the spine and toward the sides of the body, and hold that position under maximum isometric contraction. The spine does not move. The hips stay level. The only movement is the scapulae protracting fully before the squeeze is held.

The quadruped base reduces the bodyweight load on the arms compared to a full plank, making it significantly more accessible for those who struggle to maintain plank integrity for the duration of a sustained isometric hold. This means more time can be spent in the working position — squeezing and holding — rather than fighting to maintain the base. The stimulus to the serratus anterior and scapular stabilisers remains powerful and direct.

Scapular protraction in a quadruped base loads the serratus anterior against a reduced but still meaningful percentage of bodyweight. The principle is identical to the plank version — the scapulae glide fully forward around the ribcage, driven entirely by the serratus anterior, and the isometric hold builds both strength and neurological ownership of the fully protracted position. The spine-neutral, no-compensation rule remains non-negotiable — any sagging, arching, or spinal rounding reduces the load on the serratus and shifts it elsewhere. The quadruped position simply makes it easier to honour those rules for longer, producing a cleaner, more sustained stimulus.

Expect the same deep, burning contraction along the sides of the ribcage and beneath the shoulder blades as the plank version — serratus anterior working hard to push the scapulae fully forward and hold them there. The upper trap and neck should stay quiet. The spine should feel completely still. The reduced bodyweight demand of the quadruped base means there is less excuse for compensation — the position is more comfortable, so the contraction should be more focused and more sustained. Over time, this drill builds the scapular strength and stability needed for pressing, pushing, overhead movements, and long-term shoulder health — and serves as the foundation before progressing to the full plank version.