Bending from the hips with a near-straight back and slightly bent knees — the base pattern of deadlifts, rows and kettlebell swings.
The hip hinge is arguably the single most important movement pattern because it shows up constantly in daily life: every lift from the floor is a hinge, done well or otherwise. What separates it from a squat is the axis — in a hinge the hips travel backwards and the torso inclines, with only slight knee bend. Power comes from glutes and hamstrings. The most common fault is a rounded lower back caused by insufficient hamstring mobility: the pelvis tucks and load migrates from muscle into the discs. Drill: hold a broomstick along your spine — the back of your head, upper back and sacrum must all stay in contact throughout the movement.