Teach flexibility with confidence

Are you a fitness instructor looking to add a low-impact, high-value class to your schedule?

Do you see clients struggling with stiffness, poor mobility, or injury recovery—but feel unsure about how to help them? Imagine leading a structured, engaging stretching class where your students leave feeling looser, pain-free, and energized. With this specialty course, you’ll gain the knowledge, tools, and confidence to teach safe, effective, and enjoyable stretch classes.
I'm Ready!
Extensa instructor teaching a mobility class

Are You Facing These Challenges?

You love teaching fitness, but do you ever feel like something is missing? Maybe your clients struggle with stiffness, poor mobility, or stiffness, and you want to help—but you’re not sure where to start.

✔ You know stretching is important, but structuring an entire class feels overwhelming.

✔ You want to stand out as an instructor, but you’re not sure how to add value beyond what you already teach.

✔ You see clients struggling with flexibility, but you don’t have a step-by-step system to guide them safely.

✔ You want to offer a low-impact class that supports recovery, but you don’t know how to make it engaging.

If any of these sound familiar, you’re in the right place. This course will give you a proven method to teach safe, structured, and results-driven stretching classes with confidence.

This Course Gives You More Than Just Stretching Exercises—It Gives You a System

You already know stretching is important—but do you know how to lead a full-length, structured class that keeps participants engaged and delivers real results?

This course is more than just a collection of stretches. It’s a proven system designed specifically for fitness instructors. You’ll learn how to guide your students safely, confidently, and effectively, ensuring they leave every session feeling looser, pain-free, and energized.

Here’s what you’ll gain:

🎯 A Clear Teaching Methodology – No more second-guessing. Learn how to lead an effective, structured stretch class from start to finish.

📌 Practical, Ready-to-Use Routines – Get class plans that are easy to follow and adaptable for different fitness levels.

🔍 The Science Behind Flexibility – Understand what actually works and how to apply it to maximize results for your clients.

🛠️ Teaching Tools & Modifications – Know exactly how to cue, adjust, and progress each stretch to make classes more inclusive and effective.

This isn’t just about learning stretches—it’s about becoming the go-to expert in flexibility training in your fitness community.


By the end of this course, you’ll have a step-by-step framework to confidently lead effective stretch classes. You’ll know exactly what to teach, how to cue, and how to create a seamless flow that keeps clients engaged and coming back for more.

Here’s how you’ll transform as an instructor:

  • You’ll master the science of flexibility—no more myths, just proven techniques.

  • You’ll learn proper stretching techniques—so you can help clients without risking injury.

  • You’ll create full-length, structured stretch classes—ready-to-use, no stress.

  • You’ll add a valuable specialty skill to your fitness career—increasing your credibility and income.

  • This isn’t just about learning stretches—it’s about becoming the go-to expert in flexibility training.


Why Choose This Course?

This course was designed by Sarah Feilders, a flexibility expert with 25+ years in the fitness industry. Sarah has worked with Olympic athletes, high-performance teams, and everyday fitness enthusiasts to increase mobility, improve regular movement patterns and gain competitive flexibility. Now, she’s sharing her proven methods with fitness professionals like you.

Unlike generic flexibility courses, this specialty course is designed for fitness instructors. It gives you:

  • ✅ A structured, teachable system—so you can confidently lead a class right away.

  • ✅ Easy-to-follow class plans—no more second-guessing what to teach.

  • ✅ A self-paced format—learn at your own speed and start implementing immediately.

What’s Inside the Course?

Here’s what you’ll learn:

    1. Welcome Note

    2. About the Extensa method

    3. Encouraging Lifelong Flexibility and Health

    1. How the Course Works & Objectives

    2. Tips for Successful Completion

    3. Waiver and Release

    4. Safety Warning

    5. Copyright Notice

    1. Requirements

    2. The Benefits of Completing Your Certificate

    3. Practice Teaching Guidelines

    1. Measuring Exercise Intensity during a Stretch Class

    2. Planes of Motion and Joint Actions

    1. What is Flexibility?

    2. Defining Flexibility

    3. Three Types of Flexibility

    4. The Flexibility Cycle

    1. Primary Factors Affecting Flexibility

    2. Secondary Factors Affecting Flexibility
  • Woman stretching in an Extensa class

Create real change for your participants

By the end of this course, you’ll have everything you need to confidently teach a stretching class, improve your students' flexibility, and grow your fitness career.

✅ Learn the science of flexibility – What really works and why 

✅ Master proper stretching techniques – Avoid common mistakes

✅ Create full-length, structured stretching classes – Ready-to-teach routines

✅ Help clients reduce stiffness and prevent injuries

✅ Market yourself as a flexibility expert – Attract new clients and opportunities

Who Is This Course For?

This course is perfect for:

✅ Zumba & Group Fitness Instructors – Add flexibility training to your classes. 

✅ Personal Trainers – Help clients move better & recover faster. 

✅ Yoga & Pilates Instructors – Expand your flexibility expertise. 

✅ Studio & Gym Owners – Offer stretch classes to attract more members.

If you work in fitness and want to help people move better while growing your career, this course is for you.

Success Stories from Fitness Professionals Like You

“I am so glad to have found Extensa as I wanted to add a stretch class to my teaching skills. I thought I could probably wing it but in the end I decided to take a certification anyway. And I'm glad I did! ...I've also learned so much about the human body and it's made me a better instructor no matter what format I teach. I loved the program so much I became a master trainer!”

Melanie B

“I love the balance Extensa brings to my life. While teaching it, I find it so beneficial to myself as well as my participants...and I really feel that it has helped prevent injuries throughout my high diving career.”

Lysanne R

“Extensa has allowed me to better connect with my body and have more control over my movements...which makes it an even more effective workout compared to the traditional stretching class I attended before I became an Extensa instructor. Teaching it is also a unique experience and participants are very satisfied with the benefits they feel after the class”

Cynthia L

Are You Ready to Take Your Fitness Career to the Next Level?

Gain a valuable specialty skill that sets you apart from other instructors.
Get pre-choreographed classes and class segments—no stress, no guesswork.
Teach anywhere – gyms, online, private clients— encourage flexibility in every sense.

Enroll Now & Start Today!