Lumbar hyperextends on the overhead reach
Lats and erectors restrict overhead reach; lower back arches to compensate.
Overactive muscles
Latissimus dorsiErector spinae
Corrective work
Foam RollLats↗StretchLat stretch (kneeling overhead)↗Lats and erectors restrict overhead reach; lower back arches to compensate.
The overhead demand shifts attention; valgus emerges on the front leg.