If the longus is too tight, it can pull the pelvis into an anterior tilt, leading to lower back pain. If the magnus is weak, you may find your knees "caving in" (valgus) during heavy lifts like squats or deadlifts. 5. Training and Maintenance
Weak adductors are a primary cause of knee valgus (knees caving inward) during squats and landing, leading to ACL injuries. Strengthening these muscles is vital for structural balance. adductor magnus and longus