Which statement is true about upper cross and lower cross syndromes?

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These syndromes reflect postural muscle imbalances driven by patterns of muscle overactivity and underactivity around key body regions. In upper cross, the chest and some neck/shoulder muscles tend to be tight while deep neck flexors and scapular stabilizers are weak. In lower cross, the hip flexors and lumbar extensors are tight while abdominals and gluteal muscles are weak. Because the defining feature is this coordinated pattern of facilitation (overactivity) and inhibition (underactivity) around the shoulder girdle and spine, that statement best captures what the syndromes describe. They are not about universal increased strength of all core muscles, nor do they affect only the lower limbs, and they are indeed related to posture.