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  • Home
  • Explore
    • How MAT works
    • What you can expect
    • Why MAT?
    • About
    • Intake form
    • Contact
    • Collaborators
    • FAQ's

Restore Strength. Reclaim Function.

Restore Strength. Reclaim Function.Restore Strength. Reclaim Function.Restore Strength. Reclaim Function.
Book Your Appointment

You were designed to move.

Inactivity, pain, and compensation patterns can cause muscles to stop functioning as efficiently as they once did. When muscles fail to activate properly, the result can be weakness, instability, discomfort, reduced performance, and a loss of confidence in everyday movement. The process of muscle activation technique (MAT) will identify these limitations, restore proper muscle function, improve movement quality, and enhance physical capacity. 



How MAT works

The Process

The Difference

The Difference

Through targeted assessments and precise activation techniques, a typical MAT session will...


Identify limits in range of motion in the upper body, lower body, and trunk and spine.

Evaluate muscle function by shortening muscle fibers and testing their strength.

Activate muscle fibers with hands-on treatment at the tendon attachments and through muscle contractions against light resistance.

Confirm muscle fibers are firing and activated.

Integrate activated muscles into movement patterns, exercises and activities.






The Difference

The Difference

The Difference

Rather than simply treating the symptoms, Muscle Activation Techniques (MAT) focus on reconnecting communication lines between your muscles and nervous system. When muscles function properly, brain signals are transmitted efficiently, allowing for smooth, balanced, and powerful movement. 


As communication between the brain and muscles improves, the result is greater stability, improved mobility, enhanced performance, and the confidence to move through everyday activities—and athletic pursuits—with less pain and greater control.







What you can expect

Many of my clients notice improvements in strength, stability, or range of motion during their first visit. In fact, after MAT is applied, a majority of my clients experience an ability to contract muscle fibers that were previously weak or tight.


Single Sessions: For relatively simple issues or recent injuries, one MAT session is often enough to restore function and get you back to moving confidently.


Multiple Sessions: Complex movement compensations or chronic dysfunction typically requires a series of 3–5 sessions to see positive results. 


Maintenance: Preservation of mobility, stability, strength, and performance while reducing aches, pains, and movement limitations may require maintenance sessions once or twice per month.



Why MAT?

Injury

Tightness and Weakness

Tightness and Weakness

Restore movement patterns and regain confidence following injury or physical setbacks.

Tightness and Weakness

Tightness and Weakness

Tightness and Weakness

Identify and address underlying muscular dysfunction that may be limiting performance and daily activities.

Balance and Stability

Tightness and Weakness

Balance and Stability

Improve balance, stability, and reaction time to stay confident on your feet and reduce the risk of falls in everyday life.

Mobility

Performance

Balance and Stability

Move with confidence during the moments that matter most, whether you're lifting your child, carrying groceries, or simply enjoying an active life.

Function

Performance

Performance

Group of people exercising

Maintain strength, balance, and mobility while preserving independence and quality of life.

Performance

Performance

Performance

Enhance human performance through evidence-based training that improves movement, strength, mobility, and functional capacity.

About

As an exercise physiologist, educator, and researcher with more than 30 years of experience, I’ve built my career around helping people move better, feel stronger, and stay active through science-based training methods. 


I earned my doctorate in Applied Physiology in 2004, building on a strong foundation in exercise science and a commitment to understanding how the human body moves, adapts, and performs.


Throughout my career, I have served as a university professor, directed exercise physiology and sports performance laboratories, and authored more than 20 peer-reviewed scientific publications on topics including athletic performance, cardiovascular health, Parkinson’s disease, and wearable technology. My work bridges research and real-world application, allowing me to translate scientific evidence into practical, individualized strategies that improve movement, restore function, and enhance health.


At Peak Function, I combine the MAT process with the scientific knowledge and practical experience I’ve developed over three decades to help you enhance strength, mobility, balance, and overall physical function, reduce compensatory movement patterns, improve performance, and maintain long-term independence.


— Dr. David K. Spierer
Founder, Peak Function





  

Whether your goal is maintaining independence, improving movement, restoring strength, or maximizing performance, Peak Function is here to help. Schedule your consultation today, complete the intake form and take the first step toward better movement, greater confidence, and a better quality of life.

Complete an intake form

Founded over 25 years ago by Greg Roskopf, MAT is rooted in well-established neurophysiological principles with the sole purpose of reestablishing lines of communication between muscles and the nervous system to restore optimal muscle recruitment patterns so your body can move the way it was designed to move. 

Booking Options


Introductory Meeting

Personalized consultation including intake, needs assessment, and a personalized MAT (Muscle Activation Techniques) plan.


30 MINS | $55

BOOK

MAT Single Session

One MAT session designed to target and strengthen specific muscle groups for improved mobility and overall function.


1 hour | $125

BOOK

3-pack

10% off the single-session price for 3 1hr MAT sessions.


3 sessions | $337.50

BOOK

5-Pack

15% off the single-session price for 5 1hr MAT sessions.


5 sessions | $531.25

BOOK

MAT Double Session

Back-to-back MAT sessions are a great option for couples traveling from a distance, making it easy to schedule both appointments during the same visit.


2 hours/session | $225

BOOK

HOme Exercise Program

A one-hour session combining MAT and personalized consultation to develop or refine a home exercise program tailored to your needs and goals.


1 hour | $85

BOOK

Home Gym Design

Personalized home gym design tailored to your fitness goals, available space, and budget, with expert guidance on equipment selection and layout to help you build a space that supports strength, mobility, and long-term function.

inquire now

Other Certifications

Corrective Exercise Specialist

Corrective Exercise Specialist

Corrective Exercise Specialist

Personalized exercise strategies designed to address movement limitations, improve muscle function, and support better movement and performance.

Nutrition Coach

Corrective Exercise Specialist

Corrective Exercise Specialist

Practical, individualized nutrition guidance to help you build healthy habits, support recovery, and achieve your fitness and wellness goals.

Home Gym Design

Corrective Exercise Specialist

Home Gym Design

Customized home workout spaces designed around your goals, available space, and equipment needs to make exercise convenient, effective, and sustainable.

Peak Function

3602 E Campbell Ave, 2nd Floor (The Charlotte Haus) Phoenix, AZ 85018

917-992-3923

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