Head, reset, head again. Groove a firm, clean contact under a quick tempo, recovering the set position between each header.
In a tight area the server feeds quickly and the player heads back, resets, and heads again. Emphasise a firm contact each time, recovering the position between headers, and staying balanced. Keep the loads age-appropriate and stop if fatigue affects technique. Rotate roles.
Fork it into your private drills, then change the animation, adjust positions, swap equipment, or drop it into a session block.