Homepage Hero ImageCrossFit Arsenal Fitness & Jiu Jitsu

Crossfit Gym in Watertown, MA

CrossFit Arsenal: Group Fitness and Brazilian Jiu Jitsu

Our passionate and knowledgeable coaching staff will strive to help you reach any goals, both inside and outside the gym
Free 7-Day Pass

Reach new heights

No matter where you start your fitness journey, you will be pushed to become a better version of yourself.

Like-minded fitness community

Be encouraged by a community of people who care about your health and wellness just as much as their own.

Everyone is welcome

Our staff and members believe in creating a friendly environment for people at all fitness levels.

Every body is unique.
Find something that works for YOU



Our CrossFit classes are designed to challenge athletes of all levels, combining elements of cardio, weightlifting, and bodyweight exercises for a comprehensive workout. Whether you're a beginner or an experienced athlete, our program offers scalable workouts that ensure you achieve peak performance and improve your overall fitness.
Free 7-Day Pass
Brazilian Jiu Jitsu

Brazilian Jiu Jitsu

Our BJJ classes are designed for all experience levels, focusing on the art of ground fighting and submission grappling without the use of the traditional gi or kimono.
Free 7-Day Pass
Personal Training

Personal Training

Our personalized approach to fitness ensures that every session is tailored to your unique needs and objectives. Whether you're aiming to lose weight, build muscle, improve athletic performance, or enhance overall health, our expert trainers provide the guidance, support, and motivation you need to succeed.
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Getting started is easy


Book Your Free Trial

We want to hear your fitness goals, assess a good starting point, and even let you try out a class for free!

Choose Your Plan

Get guidance tailored to your body and progress consistently. We will guide you every step of the way.

Find a Supportive Community

Getting fit is hard; staying fit is harder. We're here to ensure you build healthy habits and systems that keep you on the right track.

Trusted and Loved By Hundreds of Watertown, MA Residents

Everything you need to crush your fitness goals

Class Reservations

Individualized Fitness Programming

Open Gym

Outdoor Fitness Area

Personal Training

Weekend Workout Classes

CrossFit Arsenal Fitness & Jiu Jitsu

Our community is what makes us special and it's what will keep you going

Joining a gym shouldn't be intimidating. We will help you feel comfortable getting started.

We understand that you have a busy schedule.  We will make sure your hour with us is your hour to focus on your health and blow off steam!

CrossFit Arsenal Fitness & Jiu Jitsu has been around for over a decade years helping people reach their fitness and performance goals.

Our goal is to provide an environment of success, where your coaches will guide you every step of the way.

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Conveniently Located Just off Arsenal St in East Watertown

Working out at the gym isn't easy. But getting there shouldn't be hard. CrossFit Arsenal Fitness & Jiu Jitsu is located and easily accessible from all of Watertown.

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Come visit us

39 Clarendon St, Watertown, MA 02472, United States
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Questions? We (probably) have the answers!

Do you provide free refreshments there?

We have filtered water available to our members. Other snacks and drinks are available for purchase.

Do I have to be fit to join?

No! No matter what your current fitness level is, we have the fitness program that is right for you. Every workout is designed to help you succeed, improve fitness, and move you toward your goals. Our program is designed for universal scalability, making it the perfect application for any committed individual regardless of experience.

What payment methods do you accept?

We take all major credit cards and debit cards. We do not accept personal checks.

What kind of exercises can I expect during a workout?

Our class programming will include a strength portion in which you’ll work on something like Olympic weightlifting, deadlifting, squatting, or bodyweight strength or you may work on a skill like handstand push-ups. After the strength or skill portion of the class is complete, most days will involve a workout that was programmed for that specific day. Workouts can be anywhere between 5 to 20 minutes or more.

Do I have to stop eating my favorite foods to be healthy?

No! A healthy lifestyle has to be manageable and realistic for the long term. Do enjoy special indulgences and meals! The healthier you are, the healthier you tend to want to eat. You get hooked on feeling good, and junk food just isn’t worth it. By avoiding excessive amounts of refined carbohydrates and measuring your intake of protein, carbohydrates, and fat, you will see dramatic, measurable increases in health.

Still curious? Talk to us!

Do something today that you will be proud of tomorrow.

Free 7-Day Pass