Jackie ‘O’ Henderson shows off her  slimmed-down frame during a solo tennis session

Jackie ‘O’ Henderson is sticking to her healthy new lifestyle after dropping 18kg in just five months. 

The KIIS FM shock jock, 48, worked up a sweat on Monday as she enjoyed a solo tennis session in Sydney, displaying her lean physique in navy linen shorts and a baggy white T-shirt.

Her look was completed with large sunglasses, white sneakers and a sports watch. 

She also swung a Chanel handbag over one shoulder as she packed up after her session ended.

Jackie recently candidly reflected on her weight loss journey. 

‘Last year I joined WW again because I wanted to get my health back in order and I know their program works for me,’ she said in a social media post. 

‘Losing weight was never about what I looked like in the mirror, but rather an overall sense of well-being and trying to re gain my energy levels,’ she continued.

‘Five months ago I was 18 kilos heavier and I had zero energy. My health was suffering as a result, so I decided to do a complete lifestyle change.’

Jackie said she lost weight because she incorporated daily exercise into her routine and she ate healthier. 

She also gave up alcohol, which the presenter said many of her followers may not believe. 

Jackie added: ‘I’ve never felt as good as I do now. I can honestly say I feel happier and healthier than I did in my 20’s and I’ve got more energy for myself and as a mumma (and a dog mumma!)’

Jackie previously gave her listeners an insight into her diet. 

She revealed on The Kyle and Jackie O Show that she regularly skips breakfast, a practice known as intermittent fasting.

Jackie also avoids carbohydrates, and satiates her hunger throughout the day by snacking on pre-cut pieces of steak.

She resists splurging on high-calorie foods for lunch, opting to eat just ‘three little slivers of steak’ and a few Vietnamese rice paper rolls containing fish and cabbage.

For dinner, Jackie usually eats vegetables and a protein such as chicken or red meat. 

In between meals, Jackie treats herself to smoothies and Starbucks Frappuccinos, a type of blended ice coffee drink.

The mother of one hasn’t always followed such a restrictive diet.

In February, she told Woman’s Day she used to binge on pizza, sausage rolls and microwave meals from the petrol station before she took control of her health.