Strong. Feminine. Ageless.

Boutique strength coaching for women in midlife — build strength, confidence, and community.

Studio Experience

Mindi O’s Fitness is a boutique coaching studio in St. Catharines specializing in women’s strength training, physique development, and confidence-building through high-touch coaching and small-group training.

  • Small-group coached training
  • Women-first environment
  • Expert-led programming
  • Supportive community

Coaching Pathways

In-Studio Training

Women’s group strength classes and personal coaching.

Online Coaching

High-touch transformation programs delivered through application only.

Competition Coaching

Competition coaching through selective athlete intake.

Our Philosophy

At Mindi O’s Fitness, we don’t chase trends. We build strong, capable women.

Strength is more than aesthetics. It’s resilience. It’s hormonal health. It’s confidence. It’s longevity.

We believe:

  • Muscle is protective.
  • Coaching matters more than intensity.
  • Structure beats random workouts.
  • A women-first environment changes everything.

This is not a big box gym. It’s a boutique coaching studio.

Every session is intentional. Every program is structured. Every woman is seen.

Strong. Feminine. Ageless.

Women-First Facility

Mindi O’s Fitness is proudly a women-first training studio.

Our environment is:

  • safe
  • supportive
  • intimidation-free
  • coaching-focused

Women train here knowing they are seen, respected, and coached properly.

Women’s group training is led by Mindi O’Brien under StrongHER programming. Men’s group training is offered separately under StrongER with Dennis Beitler.

What our members are saying on 

  • "Just wanted to say I love everything about the zoom workouts. I don’t feel you need to change a thing. I feel like every part of my body feels strong. When Maree brought me to your class the first time 2 years ago I didn’t know what to expect but you changed my life so I’m very grateful for Maree and you. Can’t wait to come back into the gym!"

    Stefania Fabiano

  • "I love how on the last round today you increased to 15 reps. I think that type of finisher for the last round is great. If the team looks strong, yes make us do 5 more!!! Please keep the intensity up because I’m conditioned for it. I haven’t missed 1 of your classes since you started in May!!!"

    Sheri Elchesyn

  • "I am just LOVING IT!! Your motivation is super great, helps to break up all the alone time that so many of us are experiencing at this time. It really is like we’re all together, and that’s just so great!! It’s the exact push one needs IMO. Your cueing is so spot on. I love it when I’m hearing you speak. It’s the way I would speak! It’s just really the best! Always safety first and your reminders are always on point. Your experience bar none make it all so effortless for you to do and that shows! Because we know that none of this is easy…. You’re truly the BEST and am so honored to be with you, grinding it out!"

    Dr. Joanne Hubley

  • "Mindi-thanks for kicking my butt yet again!!! I started with you last January and was only able to ome to the gym for 8 weeks. Then Covid19. I’m so happy you started zoom classes. I feel stronger and my form has improved. I always look forward to the workouts. Today I dropped some “F” Bombs though!!! I can do things that I could barely do before…like lunges and squats. Yay!!! Need to work on push-ups!! Haha!"

    Rose

  • "Friendly and supportive ...I always feel great when I leave the studio"

    Lindsay Sinodinos

  • "I had the privilege of working with IFBB Pro Bodybuilder Mindi O'Brien - Mindi, thank you for the fantastic coaching this afternoon and what a nice facility!!! Looking forward to working with you again."

    Beth Hoban-Bertone

  • "Mindi is great to work out with. A small motivated group that is fun and you get results!"

    Dianne Wilson Warkentin

  • "I love the motivation and the coaching that I get from Mindi. In order to get results from working out, you need proper instructions from trained people. You are guaranteed to get that from Mindi."

    Toni Fabiano

  • "Boot Camp is fun, positive, inspiring, and energizing!!! This is a part of my life that has so many great benefits! Getting strong, lean, flexible, feeling great and making new friends! "

    Chrissy Lihou