The first close-up snapshot showed the 55-year-old singer staring down the camera wearing a low-cut black tank top.
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Madonna: 'Post graduation workout #i'mdone'
"Post graduation workout #i'mdone," Madonna wrote next to the picture, referring to her daughter Lourdes' high school graduation earlier that day.
The superstar used the same hashtag to caption two other photos, all taken immediately after Madonna's energetic workout.
The revealing pictures appeared two days after Madonna courted more controversy on social media by sharing a photo of herself wearing a black burka with gold bars across the eyes. "It's that kind of day #unapologeticb***h," she captioned the snap.
Madonna shared three selfies following her workout
Madonna's personal life continues to make headlines too. The singer is currently dating 26-year-old Timor Steffens, following her split from French dancer Brahim Zaibat in December after three years together.
Madonna spoke openly about her romance with Brahim back in 2012.
"I didn't choose to, you know, I didn't write down on a piece of paper, 'I'm now going to have a relationship with a younger man," said the star, who was married to Guy Ritchie from 2000 until 2008.
Madonna is currently dating dancer Timor Steffens
"I don't want to live my life on my own. I love being a mother. My children fill me up in many ways, and inspire my in many ways, but I need a partner in my life and I think most people feel that way.
"I've never really lived a conventional life, so I think it's quite foolish for me or anyone else to start thinking that I am going to start making conventional choices."