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Updated: October 6, 2025 / 2025 40 Under 40 honorees

40 Under 40: Fitness entrepreneur Molly Brubaker is pumped about growth

Photo / Tim Greenway Molly Brubaker, 38: Founder and owner, Baby Booty
Molly Brubaker, 38 Founder and owner, Baby Booty Read all about the 40 Under 40 and a special event to recognize them.  
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Greatest achievement: Birthing and raising two super cool, super smart, tiny humans Ella and Beau; creating something that has become way bigger than me (it’s a cool feeling walking into your business and not knowing all the clients yet); and being a guest on my all- time favorite podcast, NPR’s “How I Built This with Guy Raz.”

Passion project: Tweaking, scaling and leveling up my business. I’m constantly thinking of new class types and offerings and ways to go beyond the norm of what else exists in the space of fitness and community for new parents.

Lightbulb moment: I realized I was going to lose a lot of who I was (as a new mom) if I couldn’t figure out a way to work out while also caring for my baby. As a lifelong athlete, exercise has been crucial to my mental health. Baby Booty was born from a personal need for not only exercise, and a sense of purpose, but unknowingly at the time, I needed connection with other moms. We now have hundreds of new parents in two studios connecting and supporting one another in our classes seven days a week.

Influential book: “Profit First,” By Michael Michalowicz (this book changed my thinking as a “struggling” entrepreneur)

Favorite movie: “Good Will Hunting” — mainly because the line “How do you like them apples?” is exactly how I feel every time someone underestimates what I can build.

Personal hero: My brother Nate — I have always aspired to be as cool as him.

Favorite quote: “If you hold on to the handle, she said, it’s easier to maintain the illusion of control, but it’s more fun if you just let the wind carry you.” — Brian Andreas

Best way to recharge: I love doing triathlons and have done three this summer. I’m also training for a Hyrox race.

Maine’s biggest challenge: Most apparent to me is the opioid crisis.

Dinner party guests: I didn’t know either of my grandmothers, Meryl and Gladys, and I’d like to think I get some of my grit, confidence and sass from a line of strong women in my family. I’d also love to meet Laura Modi, CEO of Bobbie, because she’s led a much-needed shift in infant nutrition and challenged long-held norms in the U.S.

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