DO you do self-massage throughout your body or just in you hands and forearms? How is your core strength and flexibility? If you press down on your abdominals

DO you do self-massage throughout your body or just in you hands and forearms? How is your core strength and flexibility? If you press down on your abdominals, do they feel stiff an painful? Or toned and stress-free? I ask because muscular tension can originate far away from where one may experience acute symptoms. Often learning to massage and exercise core muscles and the lats can address tension in the shoulders and arms.