Due to a past injury, Dwayne “The Rock” Johnson emphasizes functional strength over beauty in his safe core training program that he posts on Instagram. 

Dwayne “The Rock” Johnson frequently shares clips of his intense workouts on social media, but he rarely targets his core due to an old injury from his WWE career that required triple-hernia emergency surgery. In a recent Instagram Reel, Johnson shared his standard core workout routine, which focuses on building strength and stability over aesthetics. He explained that after tearing his abdomen wall, he had to concentrate on ab exercises that strengthened his entire core. Johnson acknowledged that his abs are not “perfect” like those of fitness models, but he believes that a strong core and tight abdomen wall are essential for gains. He emphasized safe training practices and building functional strength rather than solely focusing on aesthetics. 

Source: https://www.menshealth.com/fitness/a43768960/the-rock-seated-leg-raise-abs-core-workout/