ARE YOU READY FOR A TRANSFORMATION IN JUST 90 DAYS?
LOSE UP TO 40 LBS AND 4 INCHES!
AUSTIN
LOST 30.5 LBS
SHREDDED 7.9% BODY FAT
“The biggest change was the diet. If you truly want to become healthier and get in better shape, you must have a combination of diet and exercise, not one or the other…I went from a size XXL/XL shirt at the beginning of the year to a size M!”
ELYSE
LOST 22 LBS
WAIST SHRUNK 4.75″
“Well, here it is…RESULTS! I can’t believe the change in me, not just on the outside, but on the inside as well! I am smaller than I have EVER been as an adult…seriously…30 lbs smaller than the day I graduated high school. Seeing myself in pictures is surreal and I don’t yet recognize myself when I see my reflection.”
THIS FITNESS AND NUTRITION PROGRAM IS FOR YOU IF…
“WEEK BY WEEK I WAS GETTING RESULTS AND FALLING IN LOVE WITH MY LIFE AGAIN. CHEERS TO YOU MARK CAMPBELL FOR IMPROVING MY LIFE AND WAISTLINE.”
– ANNE
HI I’M MARK!
I’m the owner and lead coach at CORE Strong Fitness. We’re a small gym, with personalized attention that gets results. I’m in the gym every day. You’ll see me teaching classes, coaching clients and throwing out a dance move or two.
I have more than a decade of personal training experience, and expert certifications that few trainers have in the Midwest. Couple that with my passion for fitness and health, and you have the ingredients for success.
If you give me 90 days, I’ll give you the tools that can transform your life forever! It’s more than just amazing before and after photos. The CORE90 Challenge is about reigniting that spark on the inside too! I know how it feels to be healthy and strong! That’s what I want for you too.

FAQ
We’re located at 1000 W 25th St Ste A, Kansas City, MO 64108, in the Westside of the Cross Roads area.
We’re not just a gym – we’re a community led by highly certified coaches, including a TRX Master Instructor. Our facility also features the CORE Reset recovery room with recovery boots, sauna, and cold plunge pool for optimal post-workout recovery.
We recommend bringing:
- Water bottle
- Towel
- Comfortable workout clothes
- Athletic shoes All TRX equipment is provided at our facility.
We offer flexible pricing options to fit your goals and schedule:
- Full memberships for regular training
- Punch card options for more flexible scheduling
Yes! TRX is a highly effective low-impact workout that builds functional strength and muscle without the joint stress of traditional weightlifting. The suspension training system allows you to adjust resistance by simply changing your body position, making it perfect for progressive strength building at any fitness level.
Absolutely not! You only need the willingness to try. Our supportive community and experienced coaches will meet you exactly where you are in your fitness journey. With consistency and proper guidance, you’ll progressively work toward your personal goals in our encouraging environment.
All our classes are beginner-friendly, and our expert coaches will modify any exercise to match your current fitness level. We recommend starting with our free trial class to experience our welcoming community atmosphere and let our coaches assess your needs. Every workout can be adjusted to challenge you appropriately, whether you’re just starting or are an experienced athlete.
TRX (Total Body Resistance Exercise) is a revolutionary suspension training system that uses your body weight and gravity to build strength, balance, flexibility, and core stability simultaneously. At CORE Strong KC, our certified TRX instructors, including the Midwest’s First Certified BLACK Rank TRX Training Coach, ensure you get the most effective and safe workout experience.
We understand it’s a commitment, and we want to help get you there. Come test drive a class for free and see if the CORE Strong community is what you need to get your body back on track! Contact us today about a free class. We’ll also be happy to answer any questions about CORE90 or gym memberships.
The challenges start at the beginning of each month.
If you put in the effort, you’ll see results. CORE90 challengers typically lose up to 40 lbs and up to 4 inches.
Results are not guaranteed.
No, supplements are not required while on this program. We do, however, encourage use of plant based protein shakes and pre and post workout supplement to help you recover in between workouts.
No. We want you to learn how to balance going out, meal prepping, and cooking great simple meals.
We recommend at least 3 workouts a week. If you increase it to 4 or 5 times a week, you’ll see the best results!
We’ll work on a combination of bodyweight and strength workouts using the TRX as one tool. Even if you’ve never used the TRX, we’ll show you how to use it and feel stronger than you’ve ever felt before. There are modifications for every exercise.
Yes! We provide modifications for every exercise, based on your fitness level. Most of CORE90 challengers haven’t worked out in awhile when they join our program.
Kristin joined us at age 40, and in her words “completely out of shape.” She couldn’t do many of the exercises. “Mark was fantastic and gave me a good heart to heart. I decided at that moment I was giving everything.” She lost 8 pounds in 90 days and gained a ton of confidence.
When you commit to making a change, you’ll get your body back!
“Mark is my hero! He’s a great trainer and is helping me become a bit less heavy!”
Michael L.
“Everyone in class is friendly and encouraging. Each class is different, challenging, and fun.”
Niki W.
$1325 VALUE
ONLY $600