Rebel Wilson looks absolutely stunning in new bikini snap showing off weight loss

Rebel Wilson is continuing to show off the impressive results of her recent fitness overhaul after dubbing 2020 her "Year of Health".

In a new Instagram post, Rebel showed off her stunning figure while in a green bikini.

"Hot Tub Fine Machine (ps reminding you I have TWO university degrees)," the star first joked as she posed in the swimming pool.

She later updated the caption to simply two winking emojis.

Last week, Rebel - who has reportedly lost more than 18 kgs this year - showed off her stunning figure in skin-tight turquoise activewear.

"Closer each day ..." she wrote alongside the snap of her having climbed to the peak of Palm Beach, where the Australian soap opera Home and Away is shot.

In another photo, Rebel revealed that her epic look was activewear brand Gym Shark.

Earlier the Australian actress, looked svelte in an all-black workout ensemble, accessorised with hot pink gloves and trainers, as she demonstrated her boxing moves in a Sydney gym.

Wilson captioned it: "Fight Club!"

It comes just days after the Pitch Perfect star challenged Hemsworth brothers Chris and Liam as Australia's "latest action hero".

Rebel publicly made a New Year's resolution at the start of the year to ditch her unhealthy eating habits and kickstart a new fitness journey.

She wrote on Instagram: "Okay so for me 2020 is going to be called 'The Year of Health'.

"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 I've just had but I'm going to do it! Who's with me in making some positive changes this year?"

In an interview with E! earlier this year, her trainer Jono Castano explained he had created a specific programme for Wilson covering six days.

He said he encouraged his clients to work out daily for 45-minute sessions, noting "results come through consistency".

His personalised programme for the star includes high-intensity interval training, mobility, weights, resistance, technique and tempo. Wilson has one day off a week to rest her body.

- The Hits, additional reporting by the NZ Herald