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A day in the life of 26-year-old Kayla Itsines -- the most influential fitness star on earth -- who has a 7-million strong Instagram following

Alison Millington
Kayla Itsines

Kayla Itsines is the most influential fitness star in the world.

Her "Bikini Body Guides" (BBG) and BBG Stronger programs -- made even more popular with the new SWEAT app, created by her partner Tobi Pearce -- have resulted in over seven million Instagram followers, a best-selling book, and a community of committed fit-fanatics following her regime. 

And she's only 26.

Business Insider met Itsines, who's Australian, on her most recent visit to London.

We learned how she and Pearce built her world-famous fitness empire -- and what an average day looks like for the global health symbol.

Scroll down to see a day in the life of Kayla Itsines.

Spoiler -- there's a lot of 5 a.m. starts.

This is 26-year-old Australian Kayla Itsines, the most influential fitness star in the world.

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In April, she came out on top of Forbes' list of the world's top social media influencers in the fitness world.

She was born in Adelaide, where she still lives. She told Business Insider that as soon as she could hold a ball, she started playing basketball. 'I played all through school and ended up finishing and becoming a basketball coach,' she said.

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'I did go to uni and I started teaching, and at the same time I thought personal training would be good to study as well,' she said. So, she became a personal trainer. 'I said to my parents, 'I might take a year off because I just love personal training. I'll go back to uni, I promise.' But I didn't go back. It was the ultimate job.''

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As she trained clients -- working what she called 'insane hours' -- she would upload their progress photos on Instagram. 'I was just using the platform as a way to store my client transformations,' she said. 'Women started following from there.'

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Women across the country were asking Itsines to train them, so her partner and business partner, Tobi Pearce, suggested she create e-books for them. She released 28-day diet and fitness plans for paying customers, followed by an app called Sweat with Kayla.

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Her concept? 28-minute workouts, and a flexible yet healthy diet. 'Because it was 28 minutes it picked up quite quickly,' she said. 'People were like 'Oh wow, I don't have to work out for hours and hours.''

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She calls her plan the 'Bikini Body Guides,' a name inspired by a client who told Itsines she 'wanted to feel confident in a bikini.' However, the community created the #BBG hash tag on their own. 'As the girls purchased the program they started the hashtag BBG,' she said. 'I thought, 'That's kind of cool.''

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'Bikini Body Guides is about the mindset around what bikini body means,' she added. 'It isn't this sort of body, it's about confidence behind it. That's how the program really took off and women loved it because it was about them getting stronger internally then externally.'

'You won't find any professional photos of me in a bikini because it wasn't about that.'

Now, Itsines has a more than seven-million-strong Instagram following -- and she and Pearce are at the helm of one of the most dedicated fitness communities in the world.

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She has filled stadiums on global tours...

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...And in 2016, she published a best-selling book.

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She's graced the odd magazine cover, too.

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Most days, Itsines is up at 6 a.m. If she has a client first thing -- which she often still does -- it's even earlier. 'I'll go to the gym and set up the circuit,' she said. 'I like everything to be perfect and sanitised and clean and the floors mopped for them, so I'll go in an hour before and make sure everything's good and the music's on, so when they walk in there's a bit of a vibe.'