Michelle Obama, 55, bares abs in workout photo: 'You put me to shame'

Michelle Obama and her famous biceps are back in the gym.

In a new Instagram photo posted for “Self-Care Sunday,” the 55-year-old former first lady hoists a large medicine ball over her head while baring her abs in a black sports bra and matching leggings. According to the caption, the fitness-conscious mom of two is all about that “no pain, no gain” mentality.

“It doesn’t always feel good in the moment,” she said of her workout. “But after the fact, I’m always glad I hit the gym.”

Her followers were impressed, judging by the flood of bulging bicep emojis in the comments section.

“Come through queen,” read one comment.

“You put me to shame,” added an admirer, while one commenter added “Come on mama!”

“So proud of you Michelle,” another fan wrote. “I’m going to plank because of this post.”

Others hailed her as an “inspirational goddess” — though many also joked that unlike the former FLOTUS, they spent their ‘Self-Care Sunday” sleeping in.

In her memoir Becoming, Obama credited her regular workouts with helping her maintain a healthy work-life balance as a working mom.

Related Video: The Very Best of Michelle Obama

Read more from Yahoo Lifestyle:

• Serena Williams shows off adorable photos of daughter Olympia as a flower girl

• Toddler's viral 'Up' Halloween costume embraces his cerebral palsy

• Horror-loving couple celebrates Halloween with 'It'-themed photo shoot

Follow us on Instagram, Facebook and Twitter for nonstop inspiration delivered fresh to your feed, every day.