About Us

Juggernaut Fitness (formerly CrossFit Juggernaut) is located in Laconia, NH. Our dream was always big, but it began small in the garage of the founder, Keith Britton. Juggernaut Fitness was born December 2012 in Gilford, NH and it rapidly grew to be the unstoppable business we know it as today!

When you walk into Juggernaut Fitness, you can expect to be welcomed by a knowledgeable Coach who is eager to help you achieve your goals. We are more than just a gym; we are a FAMILY. When you join Juggernaut Fitness, you join the strongest community in the Lakes Region. You join a community who has your back with your accomplishments and strives to make a difference in our local community through participating in multiple charitable events. When you become a Juggernaut, you become an unstoppable force in all parts of life. What your body will be able do, the confidence you’ll gain and the friends you will make will do nothing but AMAZE you.

Change your life and become a Juggernaut today!

Check out our CrossFit Affiliate Page here

Meet Our Team

  • Keith Britton

    Founder

    Keith, originally from Sandown, New Hampshire, returned home after a career split between New York and Los Angeles. In 2012, he discovered functional fitness and decided to share his passion by opening a gym in the Lakes Region. This venture began in a single-car garage and had a simple mission: to help people improve themselves gradually. Keith and the Juggernaut community are committed to "Forging Positive Leadership" through their fitness journey.

  • Anna Terry

    Owner

    Anna Terry has earned her B.S in Physical Education, CrossFit Level 2 Trainer, CrossFit Defense certification and is a NASM Certified Nutrition Coach. Her goal as an owner is to create a safe space for ANYONE, regardless of age, goals, gender, injuries, etc. to become a better version of themselves through the path of health and fitness!

  • Matt Terry

    Owner

    Matt found CrossFit in 2013 and has been coaching since 2014, when he first obtained his CrossFit Level 1 Trainer certificate. Matt now holds his CrossFit Level 2 Trainer certificate and CrossFit Defense certifications. Matt spent over a decade in law enforcement and rose to the rank of Lieutenant before finding his true passion for helping others find healthier and happier lives through fitness.  

  • Sara Fogg

    Operations Manager

    Sara is the master of all trades when it comes to all things Juggernaut. She specializes in social media marketing, event planning, and customer service. In addition, she's a Pre & Postnatal Fitness specialist, a knowledgeable guide to our mama Juggernauts through their special season of life. Sara is also a CrossFit Level 1 Trainer.

  • Lis Rosencrum

    Coach

    Lis has been a Licensed and Certified Athletic Trainer and Certified Strength and Conditioning Specialist since 2006, and earned her PhD in Physical Education in 2014. She specializes in helping people of all levels safely participate in physical activity through corrective exercise and manual therapy techniques including Dry Needling, Instrument-Assisted Soft Tissue Mobilization, Cupping, and more. She found CrossFit in 2016 and fell in love with the environment and movements. She coaches classes and works one-on-one with clients to assist them toward their movement goals, with special focus on those who are returning from injury. Lis also is a CrossFit Level 1 Trainer.

  • Jason Mangiardi

    Coach

    Jason started classes at Juggernaut Fitness in 2013 after trying a number of different workout and exercise approaches. Although he had never been one to stick with any program for very long, he found the community and format of Juggernaut to be a great match for him. He has greatly appreciated the positive impact on his life and decided to pay it forward by coaching! He obtained his CrossFit Level 1 Trainer certificate in 2016 and advanced to his CrossFit Level 2 Trainer certificate in 2023. Jason works at Concord Hospital as an Ear, Nose and Throat surgeon and is the father of 2.

  • Corey Gately

    Coach

    Corey started at Juggernaut Fitness in 2016. She started with Bootcamp and has been here ever since! Corey is a CrossFit Level 2 Trainer and is also a Certified Drug and Alcohol Fitness Specialist. She is a Master's Licensed Drug and Alcohol Counselor and is the Director of Substance Use Services for Concord Hospital Laconia and Franklin.

  • Jessica Chappuis

    Coach

    Jess first found Juggernaut Fitness by joining UBCC in 2018 and quickly fell in love with CrossFit. She started coaching group classes in 2022 and is dedicated to helping others realize their full potential and reach their goals. Jess is a CrossFit Level 2 Trainer and holds an ISSA Certified Personal Training certification. Jess also has plenty of experience with personal training and helping others achieve their goals.

  • Brandon Early

    Coach

    Brandon has been a member of the Juggernaut community since 2021 and is a CrossFit Level 2 Trainer. Brandon, who grew up in Seacoast New Hampshire, transformed from a childhood lover of mac 'n' cheese and hot dogs into an active teenager through Cross Country. He continued his active lifestyle through college and later discovered functional fitness, which he embraced passionately. With nearly a decade of experience in functional fitness and four years of coaching, Brandon's favorite movements include deadlifts, double unders, and rowing. Outside of Juggernaut, he works from home, enjoys dog walks, and indulges in a game of cribbage with his partner. Saturday morning cartoons and mac 'n' cheese still hold a special place in his heart, minus the hot dogs.

  • Deirdre Moulton-Gagne

    Coach

    Deirdre, a lifelong New Englander, initially struggled with health but found renewed purpose through motherhood. She pursued a college education in small business management while raising her two sons. In 2018, Deirdre decided to prioritize her well-being, aiming to be there for her children long-term. She joined a bootcamp and, upon her sister's encouragement, attended classes at Juggernaut Fitness, initially feeling intimidated. However, her first experience during the Hero WOD, Murph, in Memorial Day 2019, revealed the inclusive and supportive community. Deirdre's passion for this fitness style grew, leading her to earn her CrossFit Level 1 Trainer certificate in 2022 and become a coach at Juggernaut. She cherishes her family, friends, and the village that is Juggernaut Fitness, emphasizing love, support, and guidance in achieving holistic wellness.

  • Mike Rosencrum

    Coach

    Mike has been a licensed Physical Therapist Assistant since 2012 with a certification in Aquatic Therapy. Mike is experienced in working with mature patient population in residential facilities. Mike has over 10 years of experience in training through the military and adult recreational settings. Mike has been training in CrossFit since 2015 and is a CrossFit Level 1 Trainer.

  • Cyndal VanSteensburg

    Coach

    Cyndal has a passion for CrossFit! She enjoys sharing her love for the sport with others. Prior to discovering CrossFit, she excelled in competitive swimming. High school also introduced Cyndal to the joys of track and field running, leading her to become a frequent gym-goer. Beyond CrossFit, Cyndal showcases her musical talents as the lead singer in a band and pursues a career in Real Estate. When not working, she cherishes quality time with herr family, often engaging in outdoor adventures! Cyndal is a CrossFit Level 1 Trainer.

  • Roxanne Stockwell

    Customer Success Manager

    Roxanne has been a member of the Juggernaut Community since 2022, and is your helpful guide as you go through your journey with us!

    Power lifting has always been a passion in her life and has afforded her opportunities to compete in the past. In her time outside of the box she works in management at a local Aerospace company, enjoys cheering for her daughter at sporting events and traveling the country by motorcycle with her boyfriend.