The stunning star, 52, was snapped in her back garden after building up a sweat on a countryside run.
Taking to Instagram, Amanda showed off her trim figure as she shared her post-workout snaps with her army of followers.
In one selfie, the Britain’s Got Talent judge is smiling sexily at the camera with a pair of headphones on her head.
Alongside a ‘green tick’ emoji, she captioned the shot: “Run done.”
Amanda has also posted another photo, but this time a full-length one.
The mum-of-two is wearing a pair of black, green and orange leggings in the shot, with a coordinating vest top and a pair of black trainers.
With her arms folded and her hair pinned up, she has barely broken into a sweat while smiling into the distance.
Amanda’s latest sizzling snaps come hours after she was spotted leaving the Heart FM radio studios in central London.
The Breakfast Show host opted to go braless underneath her plunging striped summer dress as she made her way through Leicester Square.
She kept off the chill with a denim jacket and gave waiting photographers a smile as she made her way home.
Meanwhile, The Sun has revealed that Amanda is in the running to present a huge prime time ITV show.
She is currently the firm favourite to replace the late Paul O’Grady as host of For The Love Of Dogs.
Amanda was a close friend of Paul’s and is a big dog lover herself, making her the ideal choice for the role.
A TV insider said: “Execs just feel like it’s too soon to make firm plans about the series, as it’s barely been two months since he died.
“But the feeling at the home is that it’s what Paul would have wanted.
“After all, he cared deeply about the animals in Battersea.
“Amanda is the natural choice to take over the job, not just because she’s a seasoned presenter but because she also cares about the home and would do anything for them.”