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Lead Instructor Trainers

The designation of Lead Instructor Trainer is awarded to an individual who inspires others through leadership and the Merrithew Community of Excellence philosophy. These Instructor trainers have a strong sense of team and demonstrated commitment to ensuring consistency and continual growth across Merrithew branded programs. A Lead IT has recognized experience teaching both teachers-in-training as well as private and group clients, and has been empowered with educating our worldwide network of instructors in valuable repertoire and curriculum additions.

Mary Jo Ketterhagen

Mary Jo Ketterhagen-Ida

John Garey Fitness & Pilates
Long Beach, California, USA

IT qualifications
STOTT PILATES® Matwork and Reformer, Cadillac, Chair and Barrels, ISP; ZEN•GA®, Total Barre®

Additional credentials and designations
ACE, PMA, Gyrotonic Certified, Gyrokinesis Certified, Bachelors of Science / Microbiology


Mary Jo has had a long history in the fitness industry, beginning in 1993 as an Aerobics Instructor. She first received her certification as a STOTT PILATES® Certified Instructor in 2002, and quickly moved on to become an Instructor Trainer for Merrithew specializing ZEN•GA® in 2013, Total Barre® in 2013 and is a Lead IT in STOTT PILATES®. Since becoming certified, Mary Jo has taught courses throughout the Unites States, and internationally as well. In addition to her STOTT PILATES® Certification, Mary Jo is also a certified White Lotus Yoga Instructor and a Mad Dogg® Spinning Instructor. She specializes in creating workouts for all fitness levels and helping each of her clients to reach their fitness goals.

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