Let's do this!

Kickstarting Healthy Lifestyles

Let's do this!

Kickstarting Healthy Lifestyles

Meet Kelly

Certified Personal Trainer | Certified Nutrition Coach | Speaker

I'm Kelly Jansens Mensch, a Certified Personal Trainer and Certified Nutrition Coach. I help busy professionals, men and women over 40, build strength, improve their nutrition, and create sustainable habits that fit real life. Whether we work together online or in person, my goal is simple: help you become stronger, healthier, and more confident, one step at a time.

I have struggled in the past with body image and tried various diets, which led to fatigue, frustration, and weight gain. I've also faced and overcome digestive issues, food sensitivities, and most recently, hormonal, and other physiological changes.

During the pandemic of 2020, when many gyms were forced to close, I searched for a way to stay in shape with little or no equipment. As an eternal optimist, I always look for the upside to life's challenges. This was an opportunity to help not only myself but others, by founding KJ-Fitt.

I am a driven individual who has overcome health and fitness obstacles in my own life and now stands ready to extend my experience, research, and training to help you be the best version of you.

Most importantly, I am ready to challenge you, support you, and guide you along that path to a healthier lifestyle!

Knowledgeable Training Expertise

I'm a NASM-Certified Personal Trainer and Certified Nutrition Coach with a passion for helping people become stronger, healthier, and more confident at every stage of life.

Fitness has been part of my life for as long as I can remember. From scholastic and collegiate athletics to teaching aerobics and fitness classes, I've always enjoyed challenging myself and encouraging others to do the same.

Over the years, I've trained in weightlifting, group fitness, functional kickboxing, Krav Maga, melee weapons, surfing, and snowboarding. Those experiences have taught me that there isn't one "perfect" way to stay healthy. The best fitness plan is one that fits your life, your goals, and can be sustained for the long term.

That's why every KJ-FITT program is personalized. I combine strength training, nutrition coaching, and practical habit-building to help you create lasting results—not quick fixes.

Whether you're just getting started, returning after a setback, or ready to take your fitness to the next level, my goal is to coach, encourage, and equip you every step of the way. I believe caring for our bodies is about more than how we look—it's about having the strength and energy to fully live the life God has given us.

My Coaching Philosophy

I don't believe in quick fixes, fad diets, or workout programs that leave you exhausted and discouraged.

I believe lasting change happens through consistency, accountability, and a plan designed around your life not someone else's.

Every coaching program begins with getting to know you, your goals, schedule, health history, and the obstacles you've faced along the way.

From there, I build a personalized approach that may include:

Strength training
Nutrition coaching
Habit development
Accountability and encouragement
Regular check-ins and program adjustments

Whether we're working together online or in person, my goal is to help you build sustainable habits that give you more energy, greater strength, and the confidence to enjoy life to the fullest.

Workshops & Challenges

21 Day Double Challenge Kicks off July 12

$52.00

KJ-FITT 21 Day Double Challenge

The KJ-FITT 21 Day Double Challenge combines two powerful habits — ditching sugar and walking intentionally — to help you kickstart a healthier, more energized lifestyle that lasts.

This challenge is about more than cutting sugar — it’s about gaining clarity, confidence, and consistency. You’ll learn how sugar may be holding you back from your goals and discover how intentional walking (not just steps on a Fitbit!) can transform your energy, mindset, and metabolism.

Over the next 21 days, you’ll learn, apply, and build habits that stick:

🗓 Challenge Breakdown

Days 1–7: Become a Sugar Sleuth — Discover where sugar hides and how it impacts your body and mood.
Days 8–21: The 14-Day Sugar Shutdown — Transition away from sugar and experience more energy, clarity, and control.
Throughout: Intentional Walking Practice — Learn how to walk with purpose to boost fat burn, lower stress, and anchor your goals.
Day 21: Step Into the New You — Celebrate your progress and set your course for what’s next!

You’ll Receive:
✅ A digital e-workbook + tracking sheets
✅ Recipe guide, sample meal plan, and cheat sheets
✅ Daily coaching emails + group encouragement
✅ Tools to help you sustain your results long after the challenge ends

Investment: $52.00 (due upon registration and is non-refundable)
Registration Deadline is April 26, 2026.

Purchase here or via venmo at kelly-Jansens.

⚠️ Please consult with your physician before starting any new exercise or nutrition program.

Let’s Take the First Step Together!

If you’re here, you’re likely looking for guidance but aren’t quite sure where to begin. Let’s start the conversation! Take that first step by sharing a bit about yourself and what you’re looking for. We’re here to help you get started.

KJ-FITT, LLC

Grand Rapids, Michigan, United States

Kickstarting Healthy Lifestyles

Kickstarting Healthy Lifestyles