Sylvester Stallone, 74, shows off massive bicep in workout photo: 'Doing some old school action'

Photo credit Getty Images

And you thought Rocky retired.

Ageless wonder, Sylvester Stallone, 74 -- 74!!! -- has gone and posted an Instagram photo of his bulging biceps. And Men’s Health was right on top of the post before it started getting the requisite loads of likes.

Stallone is not just showing off (well, maybe a little), but trying to use it as a motivation for all those greying guys out there.

“Went to damn the gym today when I didn’t want to,” admits the action star in the caption. “But, Doing things when you do NOT want to, I found an extremely important key to success.”

Of course his amped-up workout routine means there might be an action flick coming up in his calendar, as he hints at in the caption.

“Plus, I have to get ready to start doing some old school ACTION!”

Stallone has been working out so hard, he’s even impressed his own hard-driving celebrity trainer, Gunnar Peterson, who jumped into the comments.

And even People magazine’s #1 reason to love America, Dwayne “The Rock” Johnson was floored, commenting, "That PEAK tells a LOT of stories, brother."

What the implied movie project might be is anyone’s guess, and Stallone is always the strong silent type when it comes to hinting at his next move.

Some fans commented hoping rumors of “Expendables 4” being in the works were true and that Stallone could be back for it. If so, former co-stars Terry Crews, Dolph Lundgren, Jason Statham, and Arnold Schwarzenegger better be hitting it hard in the gym right now.

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Featured Image Photo Credit: Getty Images