On Wednesday morning, Jennifer Lopez posted an Instagram of herself posing against a plain white door—the perfect neutral backdrop for showcasing how stunningly swole she's become. Naturally, J.Lo didn't miss out on the opportunity, showing off not just her flawless makeup and very flattering formfitting dress, but also her extremely toned biceps and trap, which seem to have shown up overnight.

They are actually the product of the promise she made to herself that rather than let doing 15 shows in 27 days "wear [her] down," she "would be stronger by the end of it," resolving to not only perform, but also "work out and be in the best shape of my life." No wonder she was "feeling like Superwoman" after her show in Las Vegas on Tuesday night.

Of course, J.Lo is also human, meaning that despite her dedication, that promise was hard to keep: "There were moments I was tired and there was travel and I had to fit in my workouts where I could," she continued in her caption, "but here we are with only 3 shows left!! And I am having so many emotions but mostly just feeling strong, happy and grateful!!!" To top off that uplifting note, she also added the hashtags "#allihavefinal15," "#3showstogo," "#we’renotdoneyet," "#letsgoooo," and "#makepromisestoyourselfandkeepthem."

This summer saw Lopez turn 49, as well as get very candid about her relationship with her body. In June, she reflected on how a size zero, which she told InStyle her generation was "very much focused on," "was just so unattainable for most normal people," including herself. She also made a point to say that while she now considers herself beautiful, she used to think she was fat—an idea that the industry apparently egged on, telling her that she "should lose a few pounds." That was just a week or so after Lopez displayed even more rare honesty about her appearance, admitting that even she's mystified by how little she's aged. (Though it now looks like her workout routine may have a bit to do with that.)

There was one other thing in the background of the photo she posted on Wednesday morning: a floating tag of @arod, who presumably acted as her Instagram husband. Given the extreme closeness of the bond they've developed over the past year and a half, it's also possible that he's now also her workout buddy. If he wants to keep up with J.Lo, though, he better start stepping up his game when it comes to his own thirst traps.

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