The fitness-loving actress has been serving up workout motivation for well over two decades.
21. "Derailed" New York City Premiere, 2005
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There's nothing quite like a high-cut neckline to show off toned shoulders like Jen's.
Photo: Michael Loccisano/FilmMagic/Getty Images
20. "Horrible Bosses 2" Los Angeles Premiere, 2014
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This fun black-and-white dress showed off Jen's toned calves and upper body.
Photo: Steve Granitz/WireImage/Getty Images
19. 51st Annual Primetime Emmy Awards, 1999
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She knew how to rock a sheer, body-skimming look back in the '90s, before a ton of other celebs started sporting the trend.
Photo: Ron Galella, Ltd./Wireimage/Getty Images
18. 28th Annual AFI Lifetime Achievement Award Salute, 2000
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Sporting a slinky, simple dress, Jen has a whole lot more than just a hot guy on her arm. Check out those biceps!
Photo: Ron Galella, Ltd./WireImage/Getty Images
17. 20th Annual Critics' Choice Movie Awards, 2015
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Jen isn't usually one to show her full midriff, but she showed just a peek of upper abs in this red-hot suit.
Photo: Photo by Jeff Kravitz/FilmMagic/Getty Images
16. "Love Happens" Los Angeles Premiere, 2009
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This look gives the expression "legs for days" new meaning. Leg day, anyone?
Photo: Jon Kopaloff/FilmMagic/Getty Images
15. 61st Annual Golden Globe Awards, 2004
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Need evidence that Jen was doing the upper-abs peekaboo look before anyone else? Here it is.
(P.S. Here's why it's so hard to sculpt a full six-pack.)
Photo: Photo by Carlo Allegri/Getty Images
14. Open Roads World Premiere of "Mother's Day," 2016
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If you're noticing a pattern here, it's that Jen can rock a mini dress like no other.
Photo: Jason LaVeris/FilmMagic/Getty Images
13. The 52nd Annual Emmy Awards, 2000
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Proving that sometimes the simplest outfits have the most impact, this red column dress Jen wore in 2000 highlighted her toned curves.
Photo: SGranitz/Getty Images
12. "The Good Girl" Premiere, 2002
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In case you had any doubt (LOL), here's proof that Jen's lower abs are pretty inspirational, too.
(Looking for results? Try this 10-minute at home lower abs workout for definition in your core.)
Photo: Amy Graves/WireImage/Getty Images
11. Premiere of "Along Came Polly" In Paris, 2004
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This movie premiere look left little to the imagination—in the best way possible.
Photo: Serge BENHAMOU/Gamma-Rapho via Getty Images
10. ELLE's 18th Annual Women in Hollywood Tribute, 2011
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Short, sparkly, and low-cut are words that describe many of Jen's most figure-flattering looks, and this number is no exception.
Photo: Stefanie Keenan/Getty Images
9. VH-1 Honors, 1995
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Even during the early years of Friends, Jen looked fit and fierce.
Photo: Vinnie Zuffante/Getty Images
8. TNT's 21st Annual Screen Actors Guild Awards, 2015
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The beaded pattern on this showstopping gown helped to highlight Jen's shape.
Photo: Mark Davis/WireImage/Getty Images
7. "The Break-Up" Special Screening, 2006
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This metallic body-con dress offers a glimpse of Jen's strong AF quads and glutes. Looks like she knew even back in 2006 that strong is beautiful.
Photo: Sean Gallup/Getty Images
6. Ninth Annual Screen Actors Guild Awards, 2003
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If this outfit is any indication, Jen was the queen of the underboob before it was a thing. (FYI, she was also into self-care before it was a thing.)
Photo: Jean-Paul Aussenard/WireImage/Getty Images
5. Women In Film 2009 Crystal + Lucy Awards, 2009
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By now, you can probably tell that Jen has a thing for metallics. It's a look that certainly works for her.
Photo: Frazer Harrison/Getty Images
4. "The Leftovers" Season 3 Premiere, 2017
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Few can rock an LBD the way Jen can. This leather mini showed off the fact that she's still on top of her fitness game.
Photo: Jason LaVeris/Getty Images
3. Fifth Annual Screen Actors Guild Awards, 1999
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Could this outfit be any more of a throwback? That just makes us love it more.
Photo: DAN CALLISTER Online USA, Inc./Getty Images
2. MTV Icon Honors Aerosmith, 2002
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One of the very few times Jen has gone for a full-on crop top, this award show outfit definitely places near number one. Clearly, she'd been doing some crazy-effective abs work.
Photo: M. Caulfield/WireImage/Getty Images
1. Vanity Fair Oscars Party, 2017
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It's only fitting that the top spot goes to an outfit Jen wore just this year, proving that she's still fit AF and in better shape than ever. The arms, the abs, the legs—she's still got it all, proving yet again that age is literally just a number.
(Looking for a little anti-aging boost? These are the best anti-aging foods to add to your diet.)
Photo: John Shearer/Getty Images