Denise Austin, 66, claims that the 30-minute exercises have continued for 40 years. If you take a rest, you will rust.

The mother of SI Swimsuit model Katie Austin and a fitness pioneer recently gained notoriety for donning a '90s swimsuit.

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Denise Austin, 66, attributes her young appearance to the 40 years she has spent doing out for 30 minutes each day.

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Over 24 million exercise videos and DVDs have been sold by the fitness teacher over her decades-long career of assisting people with at-home weight loss.

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She also produced a long-running fitness show on television and wrote 12 books.

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Austin told Fox News Digital that throughout the years, being a busy mother of two girls motivated her to develop 30-minute workouts that can be performed at home rather than at the gym.

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After modeling the same pink swimsuit she wore in the most recent viral video, the celebrity.

"That’s right – I have been doing 30-minute workouts for 40 years," she replied. "I really think that you can accomplish everything in 30 minutes.

I therefore exercise for 30 minutes every day of the week to burn fat and strengthen [my heart], which is a muscle.

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