Although first introduced to the work at the age of 14, Kathryn began her Classical Pilates training in 1982 and had the privilege of studying with First Generation teachers Romana Kryzanowska, Lolita San Miguel, Kathy Grant, Sari Mejia Santo, Jay Grimes, and Edwina Fontaine. She was a Romana’s Pilates Level 2 Trainer and completed comprehensive training through The Pilates Studio, Romana’s Pilates, Authentic Pilates, and Lolita San Miguel’s PMMP Program. She has been certified by the National Pilates Certification Program and is also a Guild Certified Feldenkrais Practitioner. Beyond Pilates, Kathryn was a principal dancer for ten years with Ballet Hispanico of New York, where she also served on the Board of Directors for three years. She holds a second-degree black belt in Tae Kwon Do with an undefeated AUU sparring record. Kathryn worked closely with Romana for many years. Romana named her the founding Vice-President to her Presidency of the Authentic Pilates Guild. Kathryn often traveled, demonstrated, and taught during Romana’s workshops. She is the only woman to appear demonstrating on both the Romana’s Pilates Mat & Legacy DVDs, serving as the teacher and voice of those follow-along workouts. Romana often described Kathryn as “poetry in motion”, “like ice cream”, and honored her as her “Star of Stars.” Kathryn is also featured in the Gratz Pilates DVD – Jay Grimes Revealed. Her influence extended into the Pilates media world. Kathryn appeared — alone and alongside Romana — in multiple Pilates Style Magazine articles. She was the featured instructor in the magazine’s premiere issue, later contributing as a writer and advisory board member. For her 55th birthday, she graced the cover of the magazine, becoming the oldest solo cover model in its history, with a ten-page spread featuring her signature work The Red Thread®. Her client list includes top professionals from the athletic and entertainment industries. In 2016, she was honored as the first instructor to teach Joseph Pilates’ work at the Isle of Man – Camp 4, where Pilates had been interned. She was also the first to train the dancers of the Vaganova School in St. Petersburg, Russia, and has taught in Chile, Australia, Spain, Russia, Germany, England, Portugal, Scotland, South Korea, Israel, Brazil, Costa Rica, and throughout the United States. Kathryn’s written contributions have elevated Pilates education. Her books include:

• The Little White Mat Book – Pilates Then, Now & In-Between (English & Spanish)
• The Red Thread of Pilates: Integrated System and Variations of Pilates (Mat, Foundational Reformer, High Chair, Arm/Baby Chair)
• The Little White Reformer Book – Pilates Then, Now & In-Between
• The Little White Baby Chair Book – 88 Essential Exercises

She also modeled for Prevention’s Stretch Yourself Healthy book and DVD, and in 2023–2024 co-authored Prevention Stretch Away Pain and Wall Pilates 101. In April 2022, Kathryn, in partnership with Balanced Body, launched the KRN Pilates – The Red Thread Method App, a unique digital platform bringing her method directly to teachers and practitioners worldwide. Her greatest accomplishment has been the creation of the Red Thread Method of Pilates, first introduced in the early 2000s at Dragos Gymnasium in NYC. She created and led her first advanced teacher training in 2013, and each year continues to select dedicated instructors to join her Pilates Professional Advanced Teacher Training – The Red Thread. “My favorite thing in the world is to be able to teach the work I believe in so strongly, as my teachers so generously gave it to me.” — Kathi Ross-Nash