Is kickboxing the key to Holly Willoughby's toned figure?

Holly Willoughby was once famous for her curves but in recent months, the nation’s sweetheart has flaunted a much slimmer figure.

And now, the secret behind her new size 8 frame has been revealed.

According to Now magazine, the television presenter is committed to a leafy diet packed full of vegetables and puts her toned physique down to an all-body workout regime (which can burn up to 600 calories an hour).

A source revealed: “Holly loves kickboxing and finds it an easy way to stay trim. She even has a kickboxing bag in her spare room, so she can work out at home.”

They continued, “You can expect to burn around 500-600 calories in an hour of boxercise but it depends on your fitness levels. It’s a great overall workout as it not only incorporates shoulder and arm work but she’ll be doing squats, lunges and ab work, too. It’s a very good overall body-conditioning session and fat burner.”

And the mum-of-three has seen incredible results, as she has reportedly dropped from a dress size 12 to an 8.

But the ultimate secret behind the 36-year-old’s weight loss is her new diet.

“Holly does eat fish and occasionally chicken but it’s mainly veggies. She watches her carbs and is conscious not to overload on the bad stuff,” an insider revealed to Now magazine.

And it’s working wonders, as the This Morning presenter undoubtedly stole the sartorial spotlight at this year’s National Television Awards in a pastel-hued Grecian-inspired gown.

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Read more from Yahoo Style UK:

The best looks from Holly Willoughby’s working wardrobe and where to buy them

Holly Willoughby has a genius hack for keeping her boobs warm

The National Television Awards: Holly Willoughby leads best dressed list in Grecian gown