J.K. Simmons gets jacked for 'Justice League'

J.K. Simmons has been taking his role in the upcoming "Justice League" movie very seriously.

Fitness pro Aaron Williamson, who's been training with Simmons, recently shared several photos on Instagram of the 61-year-old actor looking insanely jacked.

Every time we train together I forget he's 61 years old. So much respect for this guy. #JKSimmons #OldManCranking (hashtag via @mountaindog1)

A photo posted by Aaron Williamson (@aaronvwilliamson) on Jun 2, 2016 at 8:52pm PDT

He's making me look bad. #JKSimmons #AintPlayinNoGames

A photo posted by Aaron Williamson (@aaronvwilliamson) on Apr 30, 2016 at 10:15am PDT

Just look at those veins.

Saturday morning, 61 years old & making the young generation jealous. This is what dedication looks like. #JKSimmons

A photo posted by Aaron Williamson (@aaronvwilliamson) on Apr 23, 2016 at 3:06pm PDT

Part One of "Justice League" is slated to hit theaters Nov. 17, 2017.

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J.K. Simmons gets jacked for 'Justice League'

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