‘Fitmum’ Sharny Kieser is a Queensland-based personal trainer and “renegade fitness expert” (her website’s words, not ours). Together with her husband Julius, she has written various diet and fitness books, including an eBook, FAT kids: help your child to escape the obesity epidemic.

She’s also been doing the daytime TV/radio circuit over the past couple of weeks, after she wrote an article for News.com.au about staying fit during her fifth pregnancy.

But it wasn’t until she appeared on Chrissie Swan and Jane Hall’s radio show that things started getting interesting.

Chrissie Swan took Kieser to task on comments that Kieser made last year, saying that overweight people were “fat and lazy”.

Boy, did she take her to task.

Here’s the full interview.

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If you can’t listen to the audio, here’s how it went down:

Chrissie Swan: I am fat and you definitely hit a nerve with me because … You know me, would you say that I am lazy?

Sharny Kieser: Um … Well yeah you have been, but I have seen you change from being lazy to getting into exercise as well, so I’ve seen you change that mindset.

CS: So you think raising three children and working sometimes 14 hours a day is lazy?

SK: I think that not fitting in exercise and not being active with your kids and trying to teach them a healthy lifestyle is definitely not the right way to go, yeah.

CS: What if I were to say to you that that is completely unrealistic and offensive and untrue?

SK: Why is it unrealistic to teach your kids to be healthy?

CS: I’m not talking about that, I’m talking about how possible it is. It’s very easy for you Sharny, whose entire life and career is in runners and running around working. So when your children are involved in your work and your job everyday is to be down at the park and running then it’s all very well to say that’s possible. When you say that fat people are lazy, you are perpetuating a myth, and you are contributing to a stigma that is untrue.