Tiny range, huge burn for the muscles that move your shoulder blades.
Keep your elbows straight the whole time, the motion comes only from the shoulder blades.
Nothing bends at the elbow here, the entire rep is your shoulder blades pinching together and spreading apart while your core holds a strict plank on two free-moving handles. That plank base is the silent workload, the trunk locked rigid so the blades can glide against a stable spine, with the serratus doing the spreading at the top of each rep. It earns its place as movement quality training, teaching the scapular control that every push up, press and plank you ever do is built on.
Because the exercise lives entirely in the shoulder blades. Elbows stay locked straight, per the cue, and the small sink-and-spread motion comes from the blades pinching and separating.
Control. The pinch and spread teach your shoulder blades to move properly under load, which protects your shoulders and adds power to every press, while your core holds the plank that makes it all possible.
The handles move, so your plank and shoulder stabilisers work far harder to keep the motion clean. The floor version is the place to learn it, the strap version is the upgrade.
