Final answer:
Lower-Crossed Syndrome is associated with weakness of the abdominals and gluteus maximus muscle groups, specifically the transverse abdominis and internal obliques, and the gluteus maximus, respectively.
Step-by-step explanation:
The Lower-Crossed Syndrome, described by Vladimir Janda, is associated with the muscular imbalance in the lumbar region of the spine and the pelvic area. It fundamentally involves a pattern of weakness/inhibition and tightness/strength in opposing muscle groups. The muscle groups typically weakened or inhibited in Lower-Crossed Syndrome are the abdominals (specifically the transverse abdominis and internal obliques) and the gluteus maximus, which is part of the gluteal group of muscles. Therefore, the correct answer is A) Hamstrings and gluteus maximus, as these muscle groups are commonly weakened and contribute to the characteristic 'crossed' pattern of the syndrome, with compensatory tightening of the hip flexor and lumbar extensor muscle groups.