Why you'll NEVER get a bottom to rival a Kardashian doing squats: Fitness model shares the very simple secret to achieving the perfect behind (and her before and after pictures prove it works)

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Millions of people believe that doing hundreds of squats per day is the secret to getting that Kardashian bottom, but one expert warns that this could be all wrong.

Personal trainer Courtney Black, 20, from East London, became an Instagram star after she transformed her body from skinny to an enviably hourglass shape with a pert posterior.

Fitness model Courtney claims that the widely popular online squat challenges being the answer to get that killer curves are a myth. 

Coutney Black, 20, from East London, showing her transformation from skinny to curvy (L-R) has shared her foolproof guide to emulating her behind - and says it has nothing to do with squats

The 20-year-old said: 'Ignore the popular squat challenges. There is no way you'll ever get a Kim Kardashian butt by doing 100 squats every day.

'It doesn't make you magically grow a bum as a lot of online challenges will have you believe - all it does is burn some calories.'

So what's the solution to getting that lusted-after hourglass figure? Courtney claims that clever weight training and reducing cardiovascular exercise are the key.

Courtney, who has nearly 150,000 followers on Instagram as a result of her transformation from skinny to curvy, explains: 'Lifting weights and pushing yourself in every session is key to getting that Kim Kardashian or Kylie Jenner shape.

Personal trainer and Instagram star Courtney (pictured after her transformation) has been teaching people how to get a booty like Kylie Jenner and says that doing squats to get a big bum is a myth

Courtney transformed her body from skinny to an enviably curvy shape with a pert posterior

'Growing your legs and upper body whilst keeping your waist slim is what creates that hourglass look.

'You can see from my before and after photos that I don't naturally have a curvy body - achieving an hourglass shape is something I've worked at.

'I'm naturally quite a straight body shape with no curves - so I focus on growing my legs, glutes and my shoulders to give the illusion of a smaller waist.

The personal trainer amassed 150,000 followers on Instagram as a result of her transformation

Courtney claims that clever weight training and reducing cardiovascular exercise are the key to killer curves

'It's about clever weight training. I recommend doing glute exercises with resistance bands so you really feel the burn and build that booty.

'And you should never use super-heavy weights when doing abdominal exercises to ensure your waist stay small.'

Courtney claims traditional cardiovascular exercise aimed at women, like spinning and running, could be hindering efforts to get that A-list body.

'You will not get maximum results or achieve that nice, sculpted bum from running on a treadmill. 

Courtney (pictured showing her transformation) claims traditional cardiovascular exercise aimed at women, like spinning and running, could be hindering efforts to get that A-list body

While HIIT workouts are great for cardiovascular health, you need to be lifting heavy weights and pushing your body to get that curvy, hourglass shape, she said.

'Adding some HIIT workouts to your regime are great for cardiovascular health but you need to be lifting heavy weights and pushing your body to get that curvy, hourglass shape!

'Women often fear that they'll get too manly or muscular from doing weight training but this could not be further from the truth. But females cannot naturally produce testosterone like men so it's impossible to gain a huge amount of muscle by lifting weights.'

In a previous interview, the Instagram star revealed at one point she weighed less than seven stone and was trolled and told that she looked like she 'was dying'. 

But after realising how miserable she was, Courtney decided to embrace her curves.

Bootyful: The part time personal trainer loves her curvier shape Courney shows off her pert posterior. 'Women often fear that they'll get too manly or muscular from doing weight training but this could not be further from the truth,' she said.

Females cannot naturally produce testosterone like men so it's impossible to gain a huge amount of muscle by lifting weights, she said

Courtney said: 'When I was younger, I just wanted to be as skinny as I could.

'I loved long skinny legs and tiny little waists. I lost so much weight that people would comment on my Instagram saying that I looked like I was dying.

'I love my curves now and I'm truly ashamed of how I used to eat and exercise.

'I want to show other people how unnecessary it is to starve yourself or cut out certain food groups from your diet. Put your health first and worry about your image second.' 

'You aren't going to get a sculpted and toned bum by living off salad leaves,' the Instagram star said. 'You need to be fuelling your workouts with nutritious meals. Keep your protein high and place your complex carbs around your workouts'

The personal trainer suggested using resistance bands to your workout. 'It doesn't matter if they're long or short, resistance bands will up your glute game!' she said. 'Add them to your any exercise e.g. donkey kicks or lunges as the will increase the tension and help you get that hourglass shape'

'No one gets maximum results from running on a treadmill,' she said. 'You need to be lifting weights to get that curvy Kardashian physique. Growing your legs and upper body whilst keeping you waist slim through weight lifting is what celebs do to create that hourglass shape'

In a previous interview, Courtney revealed at one point she weighed less than seven stone and was trolled and told that she looked like she 'was dying'

The fitness model says she loves her curves and is ashamed of how she used to diet and exercise