Jessica Kiernan

Personal Trainer, Fitness Model

Jessica Kiernan is a personal trainer, fitness model and social media sensation. She started her fitness journey at the age of 15 after being inspired by female athletes in magazines.

Since then, Jessica’s sculpted an incredible figure – becoming a fitness model herself, and guiding others to achieving their own dream physiques.

This is her story:



“I used fitness to shape my life and have structure. It saved me in so many ways.”

Athlete Statistics

Full Name: Jessica Kiernan
125 - 135lbs (56.7 - 61.2kg)5'3" (160cm)39"40"
WaistCalvesYear of Birth
AmericanPersonal Trainer, Fitness Model
Weight125 - 135lbs (56.7 - 61.2kg)
Height5'3" (160cm)
Year of Birth1983
ProfessionPersonal Trainer, Fitness Model



” I learned through many books and researching to cook healthy. I learned to exercise properly.”



  • Phase 1 Master Personal Trainer – AAAI/ISMA
  • Phsae 2 Master Personal Trainer – AAAI/ISMA



“It was when I saw a show with a beautiful, fit, well-groomed girl and I thought, That’s how I want to look!”


Fitness Journey

Born and raised in New Jersey (USA), Jessica developed a strong passion for fitness at the age of 15; she became fascinated by a health magazine, and found the desire to sculpt a figure similar to the model’s in there.

As a result, Jessica set foot in the gym and began lifting weights – kickstarting her fitness journey.

Personal Trainer

By the time Jessica was in her twenties, she’d managed to develop an incredible physique – her genetics allowed her to build strong legs, while staying slim in the mid-section.

At this point, she found the motivation to begin helping others realize their fitness goals; for this reason, Jessica worked hard to earn her personal training qualifications.

Soon after, she created an Instagram profile and website – in order to offer her services as a fitness coach.

Social Media Sensation

Jessica posted her first picture on Instagram in 2015, but it wasn’t long until she’d attained masses of followers online. Many fans around the world were fascinated by her incredible figure, with many choosing to ask Jessica to be their personal trainer.

By 2017, the american had become a social media sensation – recognized for her strong abs.



“I found that the gym was my real, true home where I could block out the world and feel completely comfortable.”


Unlike other athletes, Jessica doesn’t take any days away from the gym; the fitness icon trains 7 days a week, in order to stay in peak condition, ready for photo shoots all-year-round.

The American is known for her strong abs, and she places an emphasis on this muscle group – training her abs up to 5 times per week.

Workout Routine

Here’s Jessica’s training plan:

  • Monday – Legs & Abs
  • Tuesday – Back, Biceps & Abs
  • Wednesday – Cardio, Shoulders, Triceps & Abs
  • Thursday – Legs & Foam Roll
  • Friday – Upper Body
  • Saturday – Cardio & Abs
  • Sunday – Cardio & Abs



“Do the best you can no matter what. Not every day is going to be your best or your strongest but do your best anyway!”


Jessica has followed a strict diet since starting her fitness journey; she plans her meals around lean protein, vegetables and complex carbohydrates.

Unlike other fitness models, she chooses not to indulge in junk food – her cheat meals are still as healthy as possible, choosing ground turkey meat instead of ground beef.

Jessica also knows how helpful supplements can be – she consumes fat burners and protein powders regularly to help her reach her macros and fitness goals.

Diet Plan:

  • Breakfast – Coffee, Gluten Free Oats, Half Grapefruit, Egg Whites
  • Snack – Protein powder with Water
  • Lunch – Lean Meat, vegetables, and sweet potato
  • Dinner – Lean Meat, vegetables, and sweet potato
  • Before Bed – Protein powder with Water

Supplement Stack

In terms of supplements, Jessica takes:

  • BCAA
  • Multi
  • Whey
  • Casein
  • Magnesium
  • Fat Burners (for cardio)
  • Glutamine (before bed)

Editor’s Tip

Inspired to reach your maximum potential like Jessica? Read our comprehensive guide on how fat burner supplements can really up your game!



“Challenging myself to be better and living a fit lifestyle is what motivates me.”

Idols and Influences

Jessica has always been a ‘self-starter’ and motivated herself to embark on her fitness journey at the age of 15. However, she was first inspired by various fitness models in magazines – although she can’t remember the names of the exact female athletes.

Since Jessica became a personal trainer, she’s become inspired to help others achieve their fitness goals –  gaining her motivation from the clients she’s guided to success.


Jessica Kiernan showcasing her glutes and muscular back.

“Strive for Progress not Perfection!”

What we can learn from Jessica Kiernan

Jessica’s story has taught us to always take action and work towards our ambition; she became fascinated by fitness model’s after seeing health magazines for the first time, but she didn’t simply sit back and dream.

Instead, Jessica started lifting weights in the gym and following a strict diet plan – constantly working towards sculpting her dream figure. After she’d made progress on her own physique, Jessica decided to help others; what we can take away from this, is to always help others when we can.

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Beautiful woman

WOW! This is amazing and so wonderful to see! I am honored.
Thank you so much for the write up!
Jessica Kiernan 🙂

Hi Jessica,

Thank you for your fantastic reply! We’re glad you liked your profile – it’s an honor to have you one Greatest Physiques.

All the best! X

That IS my beautiful daughter. I’m very proud of you- love Dad!

You look amazing jrssics

She’s an inspiration to all those who want to be fit. Such a sweet person.