Core in 1990: General core deconditioning · 573

The core is the coordinated group of trunk muscles that stabilizes the spine and pelvis, transferring force between the upper and lower body during nearly every movement. Transversus abdominis, obliques, multifidus, diaphragm Spinal stabilization and force transfer 4–8 weeks to build baseline endurance

Endurance and control over raw strength The core is not a single muscle but a coordinated system spanning the abdominal wall, deep spinal muscles, pelvic floor, and diaphragm. Together, these structures stabilize the trunk and pelvis, allowing force generated by the legs to transfer efficiently to the arms and back again during walking, lifting, and sport.

Unlike most regions covered on this site, the core is rarely the site of an acute traumatic injury; instead, it is more often discussed in the context of deconditioning, muscular imbalance, or its supporting role in preventing and managing low back pain. Research on core stability exercise has grown substantially since the 1990s, though its precise role relative to general strength and conditioning remains an active area of study.