Set-up: Begin by grasping a kettlebell with two hands and bracing through your abdominals and core musculature. Drop your hips and let the kettlebell move behind you, starting just in back of your heels.
Movement: Keeping a tight brace through your core and a strong grip on the kettlebell, drive through your hips - swinging the kettlebell upwards, and overhead. Look forward and keep your arms straight, squeezing through the glutes both for drive on the way up, and stability at the top. Return to the start under control, being careful not to round or hyper-extend the back.
Emphasis: Don't shrug your shoulders or flex your elbows to attempt to extend range of motion - the hips should drive the movement.