Attention Catalyst Members!

We’re in the process of updating our software and website so we’re removing all login information temporarily.

To sign up for a Cycling or Barre class, please call your respective club or stop by the front desk.

We apologize for any inconvenience this may cause.


    Moving You

    to Better Health



Catalyst Fitness Focus


increase speed, performance, and ability through weight and resistance equipment training


improve endurance, circulation, and mind function through aerobic exercise and equipment

Weight Loss

reduce size and sculpt body shape through personalized activities and nutrition programs


keep mind and body performance-tuned through exercise, activities and personal training

Catalyst — MOVING YOU to Better Health...
through a Better Health & Fitness Club experience!

More than a typical Health Club…or a Fitness Center…or a Gym.
Catalyst is a life-enhancing experience.
We move you to better health through motivating, educating, encouraging, and really caring.
We move you to stay in better health through clean, friendly fitness centers,
cutting-edge classes and equipment,
and value-plus member benefits that include:

More About Catalyst

  • t1

    I began working with Kostas about six months before my wedding...The time that I spent in the gym with Kostas was the most fun I have had working out.

    — Diana Mirante


  • t2

    “Investing in Kostas made a significant…the integrity by which he runs his business, his persistence and expertise, and his balanced, compassionate, flexible approach…If I were to describe the experience in two words, it would be “Life Changing.”

    —Rich Morabito


  • t3

    “I began training with Janet at Catalyst…today I have progressed so that my blood pressure regularly tests at 110/70; my total cholesterol is 146 and my HDL is below 100.”

    — David Rapp


  • t4

    “Training with Stephanie at Catalyst has been the single best “health decision” I have ever made. My newfound muscle tone and weight loss are the visible counterpart to the internal strength and positivity I feel…”

    — Melissa Beth


  • t5

    “As a result of my training with Andrew, I am both physically and emotionally stronger. I am grateful for his guidance and highly recommend his training to anyone…”

    — Marianne Savarese


  • t6

    “Throughout this journey Kostas has been there to encourage me and push me beyond what I thought were my limits. He believed in me when I didn't believe in myself…”

    — Christine Peterson


  • t7

    “Cate took the time to get to know my lifestyle habits and fitness goals…by the time I finished training with her, I put on eight pounds of lean muscle…I would never have put on this many pounds of muscle without her coaching and guidance.”

    —Justin Slater


  • 100 Main Street North
    Southbury, CT 06488


    Mon. - Thurs. 5:00 AM - 10:00 PM
    Fri. 5:00 AM - 9:00 PM
    Sat. & Sun. 7:00 AM - 6:00 PM



  • 930 Straits Turnpike
    Middlebury, CT 06762


    Mon. - Thurs. 5:00 AM - 10:00 PM
    Fri. 5:00 AM - 9:00 PM
    Sat. & Sun. 7:00 AM - 6:00 PM