Core muscles are in your core joint muscles are in your arms and legs

Core exercise is important, because it help strengths the core muscles. Core muscle training will also strengthen other muscles during the training.

The abdominal muscles are considered your core muscles. The rectus abdominus, transverse abdominus, and your obliques all make up your core mucles.

Core muscles include those of the pelvic floor, internal and external oblique's, rectus abdominus, sacrospinalis, and the longissimus thoraces. Minor core muscles include the latissimus dorsi and the trapezius.

the answer is core muscles.