Is This You?

You’re a group fitness instructor who…

  • Feels the strain of teaching high-impact classes day after day
  • Wants to add a gentle, powerful stretch class to your offerings
  • Dreams of a class that supports your body as much as your students’
  • Wants to attract and retain clients who value mindful movement


If this sounds like you, you’re not alone. Many instructors just like you have found this course a game changer.

What You'll Learn

  • How to cue, structure, and lead a full-length stretch class
  • The science behind effective flexibility training—what works and why
  • Techniques that reduce stiffness, increase mobility, and feel amazing
  • Common mistakes to avoid when teaching stretching to groups


Whether you’re teaching active older adults, beginners, or fellow instructors—this course gives you the tools to lead confidently and safely.

What’s Included

    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

Who This Course Is For

  • Group fitness instructors ready to expand their class offerings
  • Instructors who want to move and teach in a way that feels sustainable long-term
  • Those looking for a low-impact class format that’s still effective and meaningful
  • Teachers who care about offering safe, intelligent movement to clients of all ages

Choose Your Path

Whether you prefer to learn at your own pace or want personalized guidance, there’s an option for you.

💻 Self-Paced

  • Complete the course on your own schedule
  • Step-by-step videos and downloadable guides
  • Start teaching stretch classes with confidence


🎯 Self-Paced + Private Coaching

  • Everything in the self-paced option, plus:
  • Four weekly 1:1 private sessions with Sarah
  • Personalized support, feedback, and mentorship


Choose Your Learning Path

No matter how you like to learn, both options give you the tools to confidently teach safe, feel-good stretch classes.

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 - Extensa Master Trainer -

“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 Instructor

“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 - Extensa Instructor

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.

Deliver the Class Your Participants Deserve

Help your participants move better, feel better, and keep coming back—while protecting your own body and empowering yourself to inspire others.

Enroll Now