But the latest one — hip dips — appears to be different from its predecessors, in that it's actually promoting self-confidence and body positivity, as opposed to making women feel inadequate because of their figures.
So, what is a hip dip? It's pretty simple: a dip where your hip meets your thigh. Some people have them; others don't, depending on their skeletal and muscular makeup.
"Hip dips are an inward curve or dent on the side of your hips right below your hip bone," Moe Widdi, a personal trainer at New York Health & Racquet Club, told TODAY. "Genetics play a key factor as to how prominent hip dips are."
Hip dips aren't bad — in fact, they can be a sign that you're in good shape.
"The nature of the muscles in that region aren't meant to protrude," Widdi added. "In fact, if the hip dip does not show, it can be due to underdeveloped muscles or high body fat, or both."
So there's no use in trying to create a perfect curve — just embrace your hip dip! That's the point many women are making on social media.
"I spent all my teenage years thinking I had awful muffin top/ love handles, hating the fact that I didn't look 'normal' in bodycon dresses," one woman wrote, describing the moment she stumbled across the term hip dip online. "Cue the life-changing moment when I realized that I did not have awful muffin top, that actually I just had high hips. My SKELETON was set this way."
In recent days, many women have taken to social media to share photos of their hip dips, also known as violin hips, inspiring others to do the same.
"The last few days I have seen a multitude (of) posts on social media from women celebrating the 'hip dip,'" another woman wrote. "Years of wasted insecurities over a flaw I thought was unique to me but turns out I'm normal after all. Ladies, love the shell you were born in, our physical diversities are what make us beautiful."
One physical trainer who shared a video demonstrating her own hip dip told TODAY she was just trying to encourage women to practice self-love.
"Social media has a habit of creating insecurities that shouldn't be a thing and my aim was to highlight this and teach people to love themselves," Olivia Woodhead said in an email.
Encouraging women to appreciate their bodies? Now that's a trend we can get behind!