About
What
Correcting faulty movement patterns
Progressive strength training
Pre-season conditioning
Coaching & training plans for long distance running
Remote programming
Where
Duddy Performance is located at 215C Boston Post Road (REAR ENTRANCE), Sudbury, MA 01776.
Or virtually, through Zoom or Facetime.
Who
Teens (athlete or not)
Adults (athlete or not)
Long distance runners
Those looking to get stronger
Those looking to learn new skills
Those looking to learn about how their body works!
Meet the Coaches
Our coaches know what they’re doing and have the experience and certifications to prove it.
Liza Duddy
Specializing in functional movement, Liza works with small groups and individuals to maintain and increase fitness. She especially loves helping young women learn to lift heavy. Also an avid distance runner, she enjoys getting other distance runners to the finish line injury-free. Contact at coachliza@duddyperformance.com
What he's done:
What they've done:
What she's done:
- CrossFit Open finisher x6
- Completed 13 marathons, including: Boston, Chicago, Maine, and Marine Corps.
- Copenhagen Marathon with wheelchair finisher 2016
- JFK 50 Mile 2020 finisher
- Javelina Jundred 2023 finisher
- 1st Place Chicago Lakefront 50 Miler 2021, age group F30-39
- 1st Place Overall Beast of Burden 50 Miler 2022, Lockport, NY
Certifications she holds:
Certifications he holds:
Certifications they hold:
- Certified Functional Strength Coach Level 2
- USA-W Sports Performance Level 1
- CrossFit Level 1
- Functional Movement Screen Level 1
- Certified Pre & Post Natal Coach, GGS
Jen Concetti
Jen is excited to coach at Duddy Performance as it’s her mission to help athletes succeed. Contact her at coachjen@duddyperformance.com
What he's done:
What they've done:
What she's done:
- Taught English in local classrooms on service trip to Nicaragua
- Hiked the Appalachian Trail through the Smokey Mountains
- Competed in a Partner Competition at CrossFit Resilience
- CrossFit Open finisher 2018, 2019
Certifications she holds:
Certifications he holds:
Certifications they hold:
- CrossFit Level 1
- Certified Functional Strength Coach Level 2
Mo Hamel
Mo loves coaching, no matter the age group (or the activity)! She loves motivating people and helping them meet their goals. Contact her at coachmo@duddyperformance.com
What he's done:
What they've done:
What she's done:
- 20 years as a varsity head coach in CT and MA (volleyball, basketball)
- MIAA Division 1 South Coach of the year in 2021
- 12 years of coaching club basketball in MA
- Currently travels the country to compete in softball tournaments
- Division II basketball player at St. Anselm college in Manchester, NH
- Hiked Macchu Picchu
Certifications she holds:
Certifications he holds:
Certifications they hold:
- Certified Functional Strength Coach Level 1
- NFHS accredited coach
- Certified Women's Coaching Specialist, GGS
Yami Rojas
Yami is passionate about leading clients to personal wins with fitness and athleticism. She most enjoys training athletes to compete at higher levels and helping individuals gain the confidence to live a more active lifestyle.
What he's done:
What they've done:
What she's done:
- Coached two seasons of NCAA Division III Women’s Volleyball in MA
- Served as NCAA Athletics Diversity and Inclusion Designee
- Hiked the Grand Canyon and Superstition Mountains
Certifications she holds:
Certifications he holds:
Certifications they hold:
- Certified Functional Strength Coach Level 1
Emily Bessette
Fitness has always been a huge part of Emily’s life, not only competitively but also for over all physical and emotional health. She jumped at the opportunity to join this amazing team to help others make fitness a priority in order to live and balanced, healthy and happy life.
What he's done:
What they've done:
What she's done:
- Played lacrosse at Johns Hopkins University
- Participated in many physical challenges...marathons, CrossFit, obstacle course racing, body building and most recently rucking.
Certifications she holds:
Certifications he holds:
Certifications they hold:
- She is in the process of obtaining her NASM CPT and her Certified Functional Strength Coach Level 1.
Jennifer Gray
Jenn's internship supervisor discovered Duddy Performance, and she feels as if the stars aligned when she met Liza and all of the other coaches. Jenn says she is “so grateful to learn amongst such an incredible group of people, coaches and athletes alike”
What he's done:
What they've done:
What she's done:
- Studied Health and Wellness at Framingham State University
- Competed in her first amateur boxing fight in 2025.
Certifications she holds:
Certifications he holds:
Certifications they hold:
- Certified Functional Strength Coach Level 1
David Harding
After college David went on into the sales industry but quickly realized that it wasn’t the path for him. He found his way back to the gym where his goal is to make everyone he trains meet their goals and be the best version of themselves.
What he's done:
What they've done:
What she's done:
- Played college football at Nichols college.
- Grew up in the gym and the dojo since his father owned a gym
Certifications she holds:
Certifications he holds:
Certifications they hold:
- Certified Functional Strength Coach Level 1.
Dylan McNary
Dylan found Duddy Performance and realized that he could try and help as many people as possible achieve their physical goals by branching into multiple avenues of training.
What he's done:
What they've done:
What she's done:
- Graduated from Noble & Greenough School in 2018 and went on to play baseball at Villanova from 2018-2021.
- Attended various internships within strength and conditioning until he was hired full time at 5 Tool Performance as the Head of Athletic Development.
Certifications she holds:
Certifications he holds:
Certifications they hold:
- Certified Functional Strength Coach Level 1
Our Mission
At Duddy Performance, we are dedicated to creating a supportive, inclusive, and empowering environment where individuals of all backgrounds can thrive. We believe in meeting each person where they are—whether they are athletes, active adults, or anyone looking to improve their health and well-being. Through compassionate and honest communication, we foster relationships built on trust and integrity.
We offer tailored programs that challenge each person based on their unique needs, ensuring they feel safe, competent, and excited about their progress.
We encourage risk-taking, embrace failure as part of growth, and believe in the power of grit and determination. With a focus on functional fitness, health, and long-term sustainability, we inspire our clients to stay committed and accountable while having fun along the way. Our commitment to empathy, encouragement, and positivity ensures that everyone who walks through our doors feels seen, supported, and motivated to keep moving forward.
We implore individuals to take ownership of their well-being, fostering an environment where young people in particular, feel empowered, confident, and comfortable in their own skin.
Our Values
Integrity
We are only as good as our word; if we say we are going to do something, we do it. We set standards for our athletes and ourselves and we uphold those standards with integrity.
Honesty
We say what we mean and are open and honest with our athletes and clients. If we don’t know the answer to a question, we will say so.
Care and Concern
We care about each and everyone of our clients. When we ask “how was your weekend” or “how is your father” or “how did you sleep” we ask with genuine care and concern. We care about the whole person, not just the workout.
Inclusivity
As is enumerated in our Zero Tolerance policy, we do not tolerate exclusion or hate of any kind. We strive to be a culture where everyone is and feels welcome, regardless of gender, race, sexual orientation or physical ability.