The "Lights" singer attended Barry's Bootcamp in Miami on Monday, where she was kicked into shape by trainer Derek DeGrazio.
But she didn't just go to a class, she took it to the next level by supplying one of her personal playlists for their workout and taking over the mic to teach the last portion of the session.
Check out Ellie's Barry's Bootcamp takeover below:
The 28-year-old's boyfriend Dougie Poynter was also on-hand to support the blonde beauty during the class.
"I like Barry's because, personally, I like to run and, to me, Barry's really focuses on running. I've done a lot of workouts that are a lot of cardio, but not a lot of running," she says. "It's an hour of your day, and then you just enjoy the rest of your day. I say doing yoga and Barry's is perfect."
The "Burn" singer also said she enjoyed teaching the class because she loves helping people get fit, too!
"I want people to get fit, I want people to keep getting better and improve. I love the idea of everyone being fit and healthy and that's why I want to put it into my own hands so if I can do it myself and and help people out," she revealed.
Looking at Ellie is definitely motivation to get into shape! What do you think about the singer's fitness passion? Tell toofab in the comment section below and check out the gallery to see more celeb hot bods!