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"It doesn't always feel good in the moment. But after the fact, I'm always glad I hit the gym," Michelle Obama said

Michelle Obama Shows Off Her Workout to Combine Self-Care and Fitness: 'Take Care of Yourself'

Michelle Obama is opening up about her fitness regimen.

On Sunday, the former First Lady shared a photo of herself on Instagram lifting an exercise ball while squatting at the gym. “It doesn’t always feel good in the moment,” Obama, 55, wrote.

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“But after the fact, I’m always glad I hit the gym. How did you all take care of yourself on this #SelfCareSunday? 💪🏾,” the mom of two added.

Obama, who led a massive White House campaign for child health and fitness during the eight years of her husband Barack‘s administration, explained the importance of women staying healthy during a conversation at the Essence Festival in New Orleans.

“We [as women] have to own our health. It’s one of these things that no one can take from you,” she said.

The best-selling author has been honing her wellness message to fans worldwide who have flocked to her stadium appearances in promotion of her book Becoming. Interviewed on stage by her friend (and CBS News anchor) Gayle King, Obama said that women need to “un-train” each other when it comes to putting their wellness last.

“When it comes to our health as women, we are so busy giving and doing for others that we almost feel guilty to take that time out for ourselves,” she said, getting personal about her own experiences.

“A lot of mothers will understand this, because I found myself looking around after I had my kids, and I didn’t have time for me, but my husband was at the gym every day. And I was like, well, how are you going to the gym? He was like, ‘I make time for the gym.’ I was like, what?” she recalled when her two daughters were babies.

Image zoom Bennett Raglin/Getty Images

“This was right when we started going to counseling, y’all, so this was one of our issues, you know? But I found myself getting mad at him because he was doing what he needed to do for him. And I think for us as women, many of us, we have a hard time putting ourselves on our own priority list, let alone at the top of it,” Obama said. “If we don’t have our act together as women, as mothers, as grandmothers, we aren’t going to be able to get our kids on track.”

Image zoom Jim Bennett/Getty

Obama told PEOPLE on her 50th birthday in 2014 that, at that milestone, she had given careful thought to health and aging — and was taking action.

“I make sure that I am up on my checkups. I have never missed a mammogram or a pap smear. I’ve had a colonoscopy. I don’t obsess about what I eat, but I do make sure that I’m eating vegetables and fruit,” she said.