Zack Morris, um, has really gotten better with age. Mark-Paul Gosselaar let it all hang out — no, seriously — when he posted a photo of himself completely nude via Twitter late last month.

The Saved by the Bell alum, 41, is currently training for a CrossFit competition. "Teaming up with @Piketoon for the @CACrossFit #pairpower competition," he wrote on Feb. 20. "@CrossFit. Some would say we've already won."

Teaming up with @Piketoon for the @CACrossFit #pairpower competition. @CrossFit. Some would say we've already won. pic.twitter.com/3EI2uMNWoW

— Mark-Paul Gosselaar (@MPG) February 21, 2015

Or maybe his fans have. In the pic, Gosselaar and animator Ben Ceccarelli are buck naked as they lean against the wall upside down. They have their hands firmly placed on the ground and are showing off every muscle of their body. A Photoshopped black line is also strategically covering their private parts. "Team Cocky," they named themselves.

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CrossFit Horsepower Dan Wells added another photo of the Franklin & Bash alum on Wednesday, Mar. 4. "Post workout recovery at @crossfithorsepower, fueled by @sfh," he captioned a pic of Gosselaar hanging from a piece of gym equipment. "Thanks for the package @mattysfh! Nice #photobomb @mpgosselaar @mallorypettas @ms_daniellelee #sfh #livinsfh #crossfithorsepower #crossfit #gym."

Gosselaar retweeted? the pic, and chimed in: "Spot the monkey."

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