Mary Cook

Mary Cook

Owner/Fitness and Nutrition Coach


CrossFit Level 2 Trainer (2021)
CrossFit Level 1 Trainer (2018)
Certified HSN Nutrition Coach
Adult & Pediatric First Aid CPR/AED
CrossFit Spot The Flaw Course
CrossFit Scaling Course
CrossFit Judges Course (2019)

Favorite WOD, Movement or Lift

WOD: Anything with burpees and squats!
Lifts: Hang Squat Cleans and Back Squats.

Favorite WOD time

6:15am or 8am

Favorite Food

Sushi and Almond Butter

Favorite Music/Band

Pop mixes - anything with a fast loud beat to keep me moving.


1 cat (HoneyBee) and 1 dog (Lucky)

Fun Fact

Brian and I got married in Nov 2017 and have a total of 6 children between us. I was on the Dr. Oz show in Feb 2017 highlighting my 200-pound weight loss. I’ve also been a licensed manicurist in the state of MA since 1999!

Favorite thing about Swarm

The people. Brian and I are grateful every day for our incredible staff and community. Swarm is like no other.

About Coach

As owner of Swarm with Brian, it is our passion to help our members achieve their goals and learn all they are capable of. It’s fulfilling my life passion to be able to be part of their health and wellness journey and help them see their potential. My passion stems from my own transformation story.

I grew up a heavy child and continued to gain weight through my teens. At 21 I was at a routine Dr’s appt and couldn't believe the scale read 352 pounds. I was told I would be wheelchair bound with knees giving out on me if I didn’t do something soon. I was guided toward weight loss surgery. It was that moment that sparked a fire that would change my life. I didn’t want surgery. I wanted to prove to myself that I could make the life long commitment to a healthier and happier me. It was a LONG road. Many ups, downs, and life events took place over the next 20 years - but I never gave up. I put in the work, and consistently showed up day after day. Leveraging portion control and making healthy nutritious food choices while maintaining my physical fitness, I finally hit my personal goal of losing 200 pounds on my 35th birthday in Nov 2014!!

When I began my journey I could only walk for a few minutes at a time. It took a long time, but slowly worked up to small walk/runs and then joined Planet Fitness. I became a licensed Zumba instructor in 2014 and taught classes 6 days week. I loved the people and the energy! Motivating and holding each other accountable – the amazing friendships.

I tried CrossFit for the first time at SWARM in October 2016 and instantly fell in love (with CrossFit, and with Brian too!) In 2017 I started to shadow the classes he coached while also focusing on improving myself as an athlete. I began assistant coaching and in Jan 2018, I became Level 1 Certified and then earned my Level 2 certification in Sept 2021. I LOVE learning and improving myself to bring the very best experience to my members’ day.

We launched our Nutrition program in 2020 and it's been an incredible addition to our gym. The program we offer is about creating fundamental lifelong healthy habits. You won’t find any fad diets here. These are habits that have helped me maintain a 200-pound weight loss over the last 8 years! I bring my life experiences to the table. I relate to the struggles as I have been there. I continue to walk the walk everyday and feel lucky to provide support and accountability to others along their journey to their healthiest self.

Turning Point

Motivation & Passion

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