Lower back hyperextends to complete the press
Strict means no lean-back; the lift ends when the lower back breaks.
Overactive muscles
Erector spinaeLatissimus dorsi
Corrective work
Foam RollLats↗StretchLat stretch (kneeling overhead)↗Strict means no lean-back; the lift ends when the lower back breaks.
Lat and thoracic restriction prevent the bar reaching true overhead.