Rebel Wilson Reveals Her Weight Loss Transformation on Instagram

The post also includes a video of Wilson at the gym, crushing it at a battle rope workout .

It's all part of Wilson's resolution to get fitter during her self-titled Year of Health.

"Okay so for me 2020 is going to be called 'The Year of Health,'" she wrote on Instagram at the start of January. "So I put on the athleisure and went out for a walk, deliberately hydrating on the couch right now and trying to avoid the sugar and junk food which is going to be hard after the holidays Ive just had but Im going to do it! Whos with me in making some positive changes this year?"

Wilson's weight loss began during filming for the 2019 musical Cats , during which she performs a solo dance number. In an interview with Entertainment Tonight , Wilson revealed that she lost eight pounds in under a week while shooting, due to the intense physical activity of the dance routines and the high temperatures on set.

"I lost eight pounds, shooting my number, in four days," she said. "One, because there's a lot of physicality... but also, they heated up the set very high, to almost 100 Fahrenheit, so that we could never cool down. These people are like, the best dancers in the whole world, so they can't cool their muscles down or they could get an injury and they'd be out of the film... So they'd heat up the set like a sauna so we would never cool down, but made it pretty uncomfortable."