Rebecca Judd shows off her very trim physique while gushing over her new activewear

She is her own best walking advertisement when it comes to modelling her popular activewear line Jaggad. 

And Rebecca Judd was at it again on Friday, promoting a pair of navy leggings and a matching crop top on Instagram. 

The 37-year-old showed off her incredibly slender frame as she gushed about how they ‘don’t move’, no matter how much you jump or jiggle around. 

‘They don’t move when you are jumping, exercising and squatting, they do not move,’ she said in the clip. 

Posing in front of her bedroom mirror, Rebecca twisted to both sides to show off the leggings and even jumped around the room to prove they won’t ride down. 

She wore her long brunette tresses in a ponytail and kept her makeup simple with a fine application of foundation and mascara.

The post comes after Rebecca made a surprise appearance during Wednesday’s episode of The Block as a ‘secret judge’.  

Just two days before the model’s appearance on the Channel Nine renovation show, rumours emerged that Bec would be becoming a permanent fixture on the show’s judging panel.

Rebecca apparently impressed the show’s bosses so much, they want her back on a full-time basis. 

‘They thought she did an amazing job,’ a source told Woman’s Day on Monday.

‘She has already proven she can hold her own on several TV shows and she’d fit in quite seamlessly.’ 

Bec has already worked on-and-off for Channel Nine for almost a decade, most recently hosting the Victorian-based travel program, Postcards.