Our goal is to give every child the ability, confidence and desire to live a physically active life.


GrowFit offer sports programs and physical education to children two to thirteen years of age. Our game-based approach allows children to build age-appropriate skills and gain confidence while having fun. Our expertly trained staff, creative programs and social-emotional approach set us apart and enable us to teach our core values of teamwork and sportsmanship.


Our Values

In addition to motor skill development, we teach children the following life skills that will allow them to be great teammates and people:

  • Be respectful. It is important to be open minded to others needs and feelings. Show respect to others, yourself and the equipment.
  • Work hard. Be a risk taker – be brave to try new things. It is important to try your best and understand practice is necessary when learning a new skill.
  • Be honest. Be honest with yourself and others.

Our Approach

  • We personalize the learning experience. Our approach allows each child to learn and develop at their own pace through developmentally appropriate learning progressions, which lead to skill competence and confidence.
  • We focus on fundamental motor skill development.  Fundamental motor skills are the building blocks for all specialized movement patterns that make it possible students to participate in a variety of physical activities.
  • We keep students moving. Our activities incorporate significant amounts of aerobic exercise to provide students with immediate health benefits.
  • We make PE fun. Children that enjoy themselves while engaging in physical activity are more likely to continue engaging in an active lifestyle.
  • We have a network of teachers and experts. With GrowFit you're not just hiring a teacher. You're getting access to the collective knowledge of our team of instructors and fitness experts.
  • We provide a supportive learning environment. Children learn best when they’re in a non-competitive environment based on self-improvement and mastery.

Our Team

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Russ Nuffer
Co-Founder, CEO

Russ is a nationally certified personal trainer with the American College of Sports Medicine and a certified Double Goal Coach by Positive Coaching Alliance. In addition to founding GrowFit, he's the Director of Fitness for The Fit Kids Foundation, a 501(c)(3) non-profit corporation that brings a free after school fitness program to children in underserved communities. He was also on the advisory committee of Stanford GOALS, a research project aimed to improve health through sports and physical activity. With a lifetime love of sports and the outdoors, he enjoys helping people discover the fun in physical fitness and is passionate about introducing a healthy lifestyle to young children. Russ graduated with a BS in Kinesiology with a concentration in Physical Therapy and minor in Psychology from the Cal Poly, San Luis Obispo.

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Ashley Schildwachter
Director of Sports Programs

Ashley has 6 years of experience teaching in urban settings with students ages 6-14. Prior to GrowFit, Ashley worked as a special education teacher and consultant in the Bay Area and in New York City. Additionally, she has experience teaching swimming to children ages 2-14 and she herself was a Division I scholarship swimmer at Boston College for all four years. 

She earned her Bachelor’s degree in Human Development & International Studies from Boston College and her Masters in Education from the New York City Teaching Fellows program at Long Island University, Brooklyn. As a lifetime athlete and health advocate, she was inspired to work at GrowFit because she believed in the team’s values to support the well being of youth through physical fitness. She is passionate about providing youth with a healthy and fun outlet for their energy and a space where they can make friends, in a team environment.

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Clare Barbella
Director of Sales & Curriculum

Clare has been instructing youth fitness classes for over eight years. She earned her Bachelors in Science in Health Education from San Francisco State University, where she developed a passion for health and teaching. In college, she volunteered her time as a Health Educator facilitating health workshops for high school teens. Upon graduation, Clare pursued a career as a physical education teacher. Additionally, Clare has taught basketball and multi-sport after school enrichment classes. She also teaches adult kickboxing classes in her spare time. She continues her professional development through the International Baccalaureate program and has recently finished her Level 1 certification

Joe Callinan
Advisor & Director of Finance

Prior to GrowFit, Joe spent 8 years as a Product Leader for a $4 billion dollar technology company.  During that time he was the Product Leader for two new products: QuickBooks Self-Employed and QuickBooks Financing. Joe earned a BS and MBA from Cal Poly, San Luis Obispo and is a Certified Public Accountant.

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Bernie Castro
Educator & curriculum developer

Bernie has taught Physical education for 2 years with GrowFit. Prior to GrowFit, Bernie coached basketball at Bayside Stem Academy and St.Peter's School SF. Additionally, he has coached basketball at the middle school level and junior high level and played basketball and football at the high school level. He is passionate about coaching and enjoys teaching youth sportsmanship and the concept of teamwork.

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Daniel Mancilla
Educator & Internal curriculum sales representative

Daniel has taught Physical Education with GrowFit for 8 years. He has worked with students ranging in age from 18 months to 13 years old. Prior to Growfit Daniel coached pee wee football for 5 years. Additionally Daniel has played rugby at the semi-pro level for 3 years. He is very passionate about making Physical Education fun for everyone. He loves mentoring children and spends his spare time with his daughter.

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Devin Harris

Devin has over 14 years of experience working with children. Prior to joining GrowFit, Devin was as an Outdoor Education teacher and basketball coach for both elementary and middle school students. In his spare time, he enjoys being outdoors, dancing and playing baseball. Devin is currently pursuing a degree in child development and looks forward to a long career in physical education.

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Frank Ciardullo

Frank has 5 years of experience teaching physical education in international settings. Prior to GrowFit, Frank was an athletic director, PE teacher and coach. Additionally, he has coached/taught soccer, basketball, badminton and futsal teams at the middle school and high school level. He earned his college diploma in recreation and leisure services from Ontario College, where he followed his passion of athletics and teaching. He was inspired to teach for GrowFit after moving from Malaysia and learning the passion of the organization. He is excited about teaching and coaching and looks forward to inspiring students of all ability levels.

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Winson Yip

Winson has 3 years of combined experience teaching and assistant teaching in elementary and middle school program settings with students ages 5 to13. Prior to GrowFit, Winson was involved in many athletics. Additionally, he  was in the volleyball club at the University of Santa Cruz. He earned his degree in environmental sciences from the University of Santa Cruz, where he found his passion for teaching and working with youth. He was inspired to work for GrowFit after realizing teaching was what he loves to do. He is passionate about being active and working with kids and looks forward to inspiring the students at La Scuola to love being active.

Amy Uriostegui

Amy has 6 years of combined experience teaching, assistant teaching and camp counseling in elementary and middle school program settings with students ages 4 to13. Prior to GrowFit, Amy was involved in many athletic and early childhood programs. Additionally, she has played almost every team sport. She earned her associates of arts at San Diego Mesa College, where she realized her passion for teaching and working with youth. She was inspired to work for GrowFit after realizing teaching was what she  loves to do. She is passionate about being active and working with kids and looks forward to inspiring the students at North Bridge to love being active.

Bobby Walton

Bobby has taught Physical Education for 6 years in a school setting with students ranging from 5 to 13 years old. Prior to GrowFit, Bobby was an AAU level basketball player and power level volleyball player. Additionally, Bobby has past and present experience coaching power level club volleyball, middle school volleyball and basketball, as well as high school basketball. Bobby is a determined athlete who is passionate about working, coaching, and mentoring youth. He looks forward to an exciting year teaching P.E.



We're hiring

Part-Time Teachers

We’re looking for part-time educators in the Peninsula area that are passionate about teaching; believe in the importance of being physically active and want to have an impact on millions of children. If this sounds like you, join us on our mission to personalize physical education and provide every child with the skills and motivation to live a physically active life.



Teaching PE and enrichment classes

This includes preparation, student assessments and communication with parents, teachers and students. In addition to PE, you may be teaching one or more of the following enrichment classes: basketball, flag football, soccer or PE games.

Furthering the curriculum and lesson plans

We believe the secret sauce to a great PE program is a personalized curriculum that allows each student to learn and develop at his or her own pace. As a teacher, you will be responsible for providing feedback and suggestions on ways to enhance the learning experience.

Improving the customer experience

There is nothing more important than the experience of our students, teachers and parents. All teachers are responsible for ensuring their schools have the best possible GrowFit experience.



  • 2+ years of relevant experience teaching or coaching elementary and middle school aged students
  • Reliable transportation (will require some travel between schools)
  • Teaching credential a plus


Name *