New Kids on the Block flaunt their abs on Instagram

It's safe to say the members of New Kids on the Block are keeping up with their fitness and then some!

Donnie Wahlberg Instagrammed this amazing shot of him and his fellow bandmates Danny Wood and Joey McIntyre at a gym on Saturday, pulling up their shirts to showcase all of their impressive abs. Keep in mind all three men are in their 40s -- Danny, 46, Donnie, 45, and Joey, 42.

"Not bad for a few old men!" Donnie wrote. "Hard work pays! #TheMainEvent."

Not bad for a few old men! Hard work pays! #TheMainEvent

A photo posted by DONNIE WAHLBERG (@donniewahlberg) on

PHOTOS: Hollywood's Sexiest Shirtless Men

And just in case you thought singer Jordan Knight was slacking, check out his own impressive shirtless body in these sexy snaps he posted this month.

"Baby I Believe in You".. 25 yrs later.. #TheMainEvent NKOTB #stillkickinass," he wrote.

"Baby I Believe in You".. 25 yrs later.. #TheMainEvent NKOTB #stillkickinass

A photo posted by Jordan Knight (@jordanknightofficial) on

Some shirtless moments as well😜 Streaming NOW #TheMainEvent live from Dallas!! #YahooLive:

A photo posted by Jordan Knight (@jordanknightofficial) on

The still handsome NKOTB members are undoubtedly in good shape for their current tour -- The Main Event Tour -- which also features TLC and rapper Nelly.

WATCH: New Kids On The Block -- Then & Now

Watch the video below for more on the ultimate nostalgia summer concert series!

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