You can go from flat-bottom-girl to bootylicious in a few seconds? Sign me up!

Oh wait. It's just a different pose...

My mom is always telling me to sit up straight and to walk tall (i.e. before it's too late and I find myself resembling the hunchback of Notre Dame).

And she's right. Posture can be everything. It can also make the difference between having what Instagram dubs "the perfect body" and having a human woman stomach with a few rolls and no butt.

So recently, an Instagram trend was started by a fitness-grammer known as @plankingforpizza showing before and after pics of her looking completely different. In the one her stomach looks ripped and in the other we see visible rolls. But here's the catch, the photos were taken seconds apart.

Lies, all lies

Read: “I lost 14kgs in 4 months to enter Miss SA” - local curvy model

I was asked how I could be both body positive and focused on losing weight and that certainly is an interesting question ?? The line between what's "healthy" or "unhealthy" or "body positive" can be really hard to define. And I've realized what I think is healthy and body positive is definitely, like most things, based on individual beliefs and opinions. Maybe you agree with mine, maybe you don't. I think what's most important is that you follow what YOU believe is right for you. My journey has always been founded on 2 principles: health and happiness. Health for me is more than the losing weight aspect. Healthy is not to "look better" it's to be better, fitter, stronger both inside and out. It's more than just eating right and exercising. It's striving for cerebral expansion and mental sharpness. Its emotional intelligence. It's a healing heart. It's becoming in tune with your authentic soul and discovering your truth. It's a freezing, thawing, and growing of your entire being. Honoring, taking care of, and respecting your body is an entity to total wellbeing. Your body shelters and protects your soul, nurture it with the love it deserves. Happiness is more of the body positive side which is not about losing or gaining weight for me. You are not you because of your body. You are YOU because of how you act, think, and feel! I am NOT happier because I'm losing weight ???? I am happier because I'm more content in WHO I am. Body positivity is an internal confidence for me. That doesn't mean I'm free of insecurities. It means I don't allow them to consume nor define me as much anymore. It's ok to love yourself AND be a work in progress at the same time!! I think you should continuously strive for self improvement in every capacity! I'm not always confident with what I look like and still have my down days, but when I redirect that negative attention and realize all the good things about WHO I am, that's where self love not only begins to grow, but flourishes ?????

A post shared by Jess (@plankingforpizza) on

So in an effort to promote body positivity, Instagrammers took on the #30secondtransformation challenge - posing two different ways only a few seconds apart - and revealing a stark difference.

Mail Online notes that “If you scroll through Instagram and compare the seemingly perfect bodies of your favourite social media stars to your own, this fascinating set of images might make the process less disheartening.”