

Redefining the aging process, one workout at a time!
We provide you with the tools and support you need to build confidence, gain strength and create healthy habits that support a long and active life.
A Community that will keep you going
We know it can be intimidating to get started on a new fitness journey (we’ve all been there at one point!). Our aim is to make sure your journey starts as fun and stress-free as possible.
Our training staff are passionate about you and your fitness goals.ย We provide top-notch and attentive coaching. Our workouts are constantly varied making sure you are always challenged and never bored.ย We show you how to move safely and seamlessly scale movements to your ability.ย This helps build up your skills in a safe manner, especially if you are new to CrossFit or any fitness routine.
If you are ready to take action and invest in a healthier you, call or come see us at CrossFit Underdog Union. We provide workouts for all abilities, expert coaching, a fun, supportive environment and offer 1×1 nutrition coaching services. It is everything that you need to crush your goals!!
Group Crossfit Classes
Nutrition Coaching
Personal Training
Constantly Varied
You won’t get comfortable. Our workouts are always changing!
EXPERT COACHES
Our coaches have what we call the G.A.F.F. Itโs the Give a F*&K
Factor. We care.
AMAZING COMMUNITY
ย The friendships and community are just as important as the workouts! Come be part of a community that feels like family.
Nutrition Coaching
We believe something as fundamental as nutrition, shouldnโt be complicated. Which is why we use a comprehensive habit-based approach to nutrition and an enormous supply of resources to keep you on track!
Happening Now at CUU
Adaptive Fitness is HERE! We are Partners of the Special Olympics of CT


New to CrossFit?
EXCELLENT Based on 28 reviews Posted on sharon Bell2025-11-05Trustindex verifies that the original source of the review is Google. Awesome crossfit gym..all classes are coach led am.pm classes...family atmosphere..everyone cheers each others success.. always switching up the wod..also offers personal coaching..Amie is excellant coachPosted on Deanna Shukis2025-10-28Trustindex verifies that the original source of the review is Google. I joined in July and it has been life changing for me. I have built confidence I never knew I could achieve and am learning how amazing it is to challenge myself physically every single session. My body and mind have been transformed in ways I never thought possible. I canโt live without it now. If I could rate 10 stars I would. Love this group of members so much and finally found my place.Posted on Kim Meares2025-10-14Trustindex verifies that the original source of the review is Google. CrossFit Underdog Union is more than a gym!! I love CrossFit Underdog Union and am so grateful I became a member. Coach Amy has exceeded all of my expectations for a gym and a fitness coach. Sheโs created a friendly, supportive community that welcomes all body types, ability levels, and genders. I appreciate her focus on safety and proper form above all else. Each 1-hour workout is broken down into smaller, functional movements that help me build strength and confidence. When I started, I couldnโt do a pull-upโnow, with consistency and Coach Amyโs guidance, Iโve made what once felt impossible a goal that I will one day actually achieve! I love tracking my progress on the CUU app, setting personal bests, and being part of a community that celebrates every success together. Connect with Amy and give it a try.Posted on Lynda Nedzweckas2025-10-12Trustindex verifies that the original source of the review is Google. I love it at CUU. The work outs are always different & made for you. The coaches are amazing! From the first day I walked in the door,I felt like I've been there forever. All were so welcoming. We did a 28 day nutrition challenge & it was amazing. I learned many new habits that are making me the healthiest I've been. CUU and nutrition coaching are highly recommended by me!Posted on Kerry O'Shea2025-10-12Trustindex verifies that the original source of the review is Google. Joining CrossFit Underdog Union a year ago I never anticipated how strong and healthy I could feel in such a short time. The guidance of the outstanding coaches along with the nutrition counseling I've received has helped me to transform my body. I highly recommend CrossFit Underdog Union to anyone who is serious about getting fit and healthy.Posted on Melissa Hoyt2025-10-12Trustindex verifies that the original source of the review is Google. Update: Since my last review, Amy asked me if I ever thought about coaching. I didn't, but with her support and guidance, I am now a certified L1 coach!! I couldn't have done it without her support and encouragement!! She saw something in me, I never saw in myself! She also introduced me to Healthy Start Nutrition and in just a short time and easy habits I have made huge gains in my health and body composition!! Thank you Amy!!!! Crossfit Underdog Union has become my home away from home. The owner, coaches, and members are supportive, inspiring, empathetic, encouraging, and sincere! From day one, I felt like I belonged. Getting fit and strong are just a bonus to gaining friends who feel like family. Thank you CUU for providing a welcoming environment where everyone feels at home.Posted on Tracy Walker2025-10-12Trustindex verifies that the original source of the review is Google. The hardest part is walking through the door for the first time. Once that is done you'll never feel alone in this journey alone. It's a fantastic and supportive group, I have learned so much!Posted on Cheryl Anderson2025-10-10Trustindex verifies that the original source of the review is Google. Highly recommend this gym! Amy is amazing! The workouts and the Nutrition program have taught me a new way to take care of myself to perform at my best in and out of the gym! The nutrition program helped me to look at food differently creating a better way of eating and having more energy! Year and a half later and I still use the tools and knowledge from this program and still killing it!Posted on Stephanie P2025-10-08Trustindex verifies that the original source of the review is Google. CUU is the gym for everybody! ๐๏ธโโ๏ธ ๐ช ๐๏ธโโ๏ธ

