Forget the gym, it's time to get on that Dancing With the Stars fitness plan! 

The former Dawson's Creek alum and most recently DWTS contestant, James Van Der Beek took to Instagram to show off an incredible transformation after dancing his butt for the dance competition.

James posted a side by side shirtless selfie showing off his new physique, writing: "Fight training vs. dancing... I'd been training in Muay Thai three days a week for about six months (for the next project I'm writing) when I hit pause to dance six hours a day. Now I can rhumba." 

James made it to the DWTS semifinals before being sent home just before this week's season 28 finale—Bachelorette star Hannah Brown took the mirror ball trophy earlier this week. 

While James didn't take home the trophy, he still got some abs to show. 

In the pictures James shared on Instagram, he looks fit in both if you ask us—but in the second photo on the left, the Dawson's Creek star definitely looked a more defined and toned. 

And James hasn't been the only one to show off his major transformation after being on DWTS.

Other stars like Ally Brooke, Lauren Alaina, Sasha Pieterse, Drew Scott, Jennie Garth, Amber Rose, Kelly Osbourne and many others have lost as much as over 40 pounds from being on the show.  

Check out our gallery below and see how many others have transformed their bodies through dance! 

Ally Brooke, Dancing with the Stars Weight Loss

Rick Diamond/Getty Images/ABC/Eric McCandless

Lauren Alaina, Dancing With The Stars Weight Loss

Getty Images

James Van Der Beek, weight loss, instagram

Instagram

Sasha Pieterse, DWTS, Weight Loss

Jonathan Leibson/Getty Images; ABC/Eric McCandless

Drew Scott, DWTS, Weight Loss

Jonathan Leibson/Getty Images; ABC/Eric McCandless

Amber Rose, DWTS, Weight Loss

Getty Images

Kelly Osbourne

Stephen Lovekin/Getty Images; Maury Phillips/WireImage

Kirstie Alley

Brian Zak/Sipa Press; Johnny Nunez/WireImage.com

Marie Osmond, Winter 2006, fall 2007, 2008

Jason Merritt/Getty Images; Ethan Miller / Getty Images

Jennie Garth, Before and After Split

Ricki Lake

Jason Merritt, Frederick M. Brown/Getty Images

 Bristol Palin

Frederick M. Brown; Araya Diaz/Getty Images

Tia Carrere

Jeffrey Mayer/SGranitz/Getty Images

Margaret Cho

Ethan Miller/Getty Images; John Shearer/WireImage

Kendra Wilkinson

Vivien Killilea/Paul Warner/WireImage

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