Hip-Shoulder Separation

The angle between the line of the hips and shoulders at back-foot contact — the elastic loading mechanism for fast bowling.

Stored elastic energy converts to angular velocity at the shoulder — every additional 10° adds roughly 3–5 km/h to release speed.

Elite quicks measure 40–60° of separation; the trunk muscles act like a spring released at front-foot contact.

Closing off the front side too early kills separation; drill with med-ball rotational throws.

Mixed actions (front-on hips with side-on shoulders or vice versa) sharply increase lumbar stress-fracture risk.