
"The core" refers to the muscles of the abdominal muscles (eg internal and external obliques, rectus and transversus abdominus, the lumbar spine, hips, and muscles that run through the pelvis. It is the synergy of these muscles that plays a critical role in providing support, stability, and power to the body's movements - kind of important for all elements of your workout.
Exercises aimed at improving core stability often involve holding specific positions or performing controlled movements that challenge the muscles to maintain proper alignment and control. These exercises could include the plank, dead bug and bird dog exercises. These exercises though are challenging for someone starting out, seek some help from a health or exercise professional to show you through the progressions that are right for you. Too much strain too soon and without good positional control can cause more harm than good.
Examples of exercises that help develop advanced core strength include controlled leg raises, plank rolls and swiss ball "stir the pot" type exercises. NB - For protection of the spine, twisting motions under load are an abnormal motion for the lumbar spine and not recommended.
This combination, when all things work well, can acts like an internal weight lifting belt capable of supporting the spine in lifting, loading and explosive movements (like jumping and throwing). It helps to maintain lumbar spinal alignment and distribute some of the load through the region.
Remember to maintain proper form, focus and engage your core muscles, breathe consistently throughout each exercise, and integrate your pelvic floor. If you're new to stabilisation exercises or have any health concerns, consider seeking guidance from a fitness professional or healthcare provider before starting a new workout routine.