LOS ANGELES, CA - JULY 17: Actor Dwayne Johnson speaks onstage during Nickelodeon Kids' Choice Sports Awards 2014 at UCLA's Pauley Pavilion on July 17, 2014 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)

Want to know how ‘The Rock’ keeps his 21 inch guns so swole?  He shared a portion of his workout on his Instagram page.