The document discusses bracing the core and core muscle anatomy. It defines bracing the core as the conscious activation of core muscles like the transverse abdominis, rectus abdominis, and obliques to create stability. It describes the functions of these muscles and emphasizes exercises that work on flexion, rotation, lateral flexion, and anti-movement patterns to build core stability while maintaining a neutral spine. These include planks, bridges, pallof presses, and various exercises using medicine balls or cables. Proper breathing through the diaphragm is also highlighted as important for core function and overall health.