
Fitness Integrated Science is a biomechanics-based personal training and muscle health center in Louisville, Kentucky.
For nearly four decades, we have helped people build stronger muscles, improve physical function, recover from injury, and stay active through highly individualized, science-driven training.
Individual and Group Strength Training & Exercise Instruction
Muscle Activation Techniques (MAT) & Rehabilitation Training
In-person & Online Instruction and currated Fitness Programs

Lauren Eirk, MS, MAT-Rx, C-IAYT, E-RYT 500, is the owner of Fitness Integrated Science and a Muscle Health and Exercise Mechanics specialist with nearly 40 years of experience. She is known for her individualized, biomechanics-based approach to strength training, injury recovery, and long-term muscle health.
Lauren is the creator of the FIS 5-Step Isometric Method™ and FIS OnDemand, an online strength and muscle-health platform designed to help adults over 50 build and maintain strength, support their joints, and exercise with greater confidence. She is also the host of the Making Muscle Memories Podcast™ and a longtime fitness educator who has presented and written nationally on resistance training, active aging, biomechanics, injury prevention, and joint health.
Integrated Science blends biomechanics, anatomy, and structured movement to create personalized fitness plans that prioritize joint safety, muscular balance, and long-term physical resilience for strength and longevity at every stage of life.
Your journey at Fitness Integrated Science® begins with a personalized Health Assessment, where we evaluate your posture, range of motion, and movement patterns using evidence-based tools and Muscle Activation Techniques (MAT). This allows us to identify areas of weakness, imbalance, or dysfunction so we can create a program that supports your individual goals — whether you're recovering from injury, looking to build strength, or improving joint health.
To support your progress outside the studio, we also offer the FIS TV app, which includes a “Getting Started” video series and guided collections like:
Assessment Collection – Evaluate your own range of motion and identify key areas of focus.
Prepare Collection – Build foundational strength with beginner-level isometrics and mobility routines.
Living Better Collection – Target specific injuries or conditions with safe, joint-friendly movement options.
For structure and consistency, many clients begin with the 3-Day Fitness Plan and gradually work up to longer weekly programs or specialized challenges. You’re always welcome to explore at your own pace — and we’re here to guide you every step of the way.
At Fitness Integrated Science®, we combine hands-on personal training and therapeutic services with virtual resources to support your progress outside the studio.
During in-person sessions, you'll receive individualized instruction grounded in biomechanics, resistance training, and muscle activation techniques. To supplement your work in the studio, you’ll also have access to guided videos, educational content, and targeted exercise routines via the FIS TV app — available anytime to reinforce what you’re learning.
New clients can schedule a complimentary 15–30 minute consultation to review goals and get oriented. For added support, we also offer virtual private sessions with Lauren, and our FIS TV Private Facebook Group provides daily insights, updates, and motivation to keep you on track wherever you are.
Always consult your physician first. You can follow Isometric Boost, C.P.I., and other therapeutic videos in the Activate | Joint Therapeutics collection. Go at your pace, listen to cues, and follow modifications for safe progression.
Yes! At Fitness Integrated Science®, we offer progressive, goal-based workout plans to complement your in-person training.
Whether you're working one-on-one with a trainer or attending group sessions, you'll have access to pre-programmed workout plans that are designed to train your entire body over the course of a week. These routines are built to progress day by day, helping you feel stronger, more stable, and more confident in your movements.
For continued support between sessions, you can access these programs — including member-favorite challenges — through the FIS TV app, where new videos are released every Monday and Wednesday. Repeating these workouts can help you improve your technique, reinforce coaching cues, and stay consistent with your goals.

Muscle Activation
Muscle Activation Techniques help identify and correct muscle imbalances, improve joint stability, and restore optimal movement patterns for increased strength, mobility, and pain-free performance.

Personal Training
Personal training offers customized workouts tailored to your goals, fitness level, and limitations—helping you build strength, improve mobility, and stay motivated with expert guidance and support.

Prehab & Rehab
Rehab and prehab focus on restoring function after injury and preventing future issues by improving joint stability, muscle balance, and movement efficiency through targeted corrective exercise strategies.

Private Pilates
Pilates strengthens core muscles, improves posture, enhances flexibility, and promotes body awareness through controlled, low-impact movements that support joint health and balanced muscular development.

Yoga Therapy
Yoga combines breath, balance, flexibility, and strength to promote physical health, stress relief, and mental clarity—supporting joint mobility, posture, and overall well-being through mindful movement.

FIS OnDemand™
FIS OnDemand is an online platform that delivers biomechanically based, muscle-driven workouts and programs designed rebuild strength, improve joint mobility, reduce pain, and prevent injury in adults over 50.

© Copyright 2026. Fitness Integrated Science. All Rights Reserved.