Knee pain is something Dwayne Johnson is all too familiar with after he tore the top of his quad off of his pelvis, back during his WWE days, resulting in not one, but four knee surgeries. But, recently, the 51-year-old shared with his Instagram followers the bodyweight exercise he’s re-added back into his leg day routine to help strengthen his knees again, and it’s one Jason Momoa approves of too.
