Technical errors (all formats)
Swinging arms : Cause #1 — arms swinging at contact, unpredictable ball. Fix: "the platform is passive, the legs are active".
Broken platform : One forearm higher than the other — lock the elbows and push the thumbs down.
Arms joined too early : Slows movement and prevents the late bump/hands choice. Join the hands only on arrival.
Torso too upright : The platform passes under the ball → pass too far from the net. Lean forward 30-45°.
Contact above the navel : Too high = reduced control. Aim for contact at waist height or lower.
No freeze : Still moving at contact = direction impossible to control. Freeze completely.
Errors specific to 6v6
Libero out of position : Too centered, they miss short serves in the corners; too lateral, they give up the middle. Reference target: Z6 lined up with the opposing server.
Setter overlap : The setter leaves their position before the opposing serve contact — fault #1 in 5-1 (FIVB Rule 7.4). Their feet must respect front/back relationships until contact.
5-passer reception with no clear roles : In the W, the 3 front-row players get in each other's way in the middle zone. Explicitly define who takes the ball between P3 and P6 on axial serves.