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“The Rock” Shows Off His “21 (inch) Gun” Bicep Curl Workout

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

21 inch Gun salute. Hellish bicep ???????? finisher I love called 21's. 7 reps from the top going only half way down. 7 reps from the bottom going only halfway up. 7 full reps. And pushing past your pain threshold to squeeze out a few more extra reps is where success and magic happens. THANK YOU for making my #BendBoundariesCollection a very big success for #ProjectRock & @underarmour. AVAILABLE NOW at @dickssportinggoods and in my LINK UP TOP ☝????☝???? #DwayneJohnsonTraining

1m Likes, 11.7k Comments - @therock on Instagram: "21 inch Gun salute. Hellish bicep ???????? finisher I love called 21's. 7 reps from the top going only..."