Our Team

About Manduu America’s Leadership Team

Headquartered in Nashville, TN, Manduu America’s team includes a seasoned entrepreneur and commercial real estate investor, a local mayor and career financial consultant, a former hospital executive, a registered nurse and longtime personal training entrepreneur, and three leading orthopedic surgeons. Across our diverse group of founders we all saw the results—and potential—in electrical muscle stimulation (EMS) fitness.

Jason Ritzen
Chief Executive Officer

Jason is a 20+ year veteran of the real estate industry. He’s an entrepreneur who launched multiple tech companies.

Robynne Napier
Chief Information Officer

Robynne has served as CFO and CIO of the Ritzen Group, Inc. since 2010. She’s also the former CFO and COO of TomKats Catering.

Mandy Oakes
Director of Client Experience

With more than 10 years of experience serving as an athlete, fitness motivator and boutique gym owner, Mandy is dedicated to client service and retention.

Nicole Astone, MS, EXNS
Marketing Coordinator

Fitness professional who specializes in designing and leading individualized workouts for adults of various skill levels. 4+ years of experience in nutrition counseling.

See Manduu’s Impact Across the U.S.

Manduu is leading a revolution in the fitness industry, one that will transform the way people create and maintain strength. Find out why muscle stimulation workouts are gaining such momentum and attracting attention from a wide range of clientele.

In the News

Find out how EMS fitness is disrupting traditional exercise as we know it, leading to greater strength and muscle fatigue and powerful whole-body results.

Franchise Opportunities

Put yourself at the forefront of America’s next fitness revolution. With thousands of studios in Germany and Austria alone, EMS fitness is logging millions of sessions in Europe each year. Now FDA cleared in the U.S., Manduu is radicalizing fitness across America.