SIRT - Steelhose Instability Resistance Training

The SIRT System is your world class solution for strength, conditioning, mobility, sport and activity-specific programs

FitFighter Steelhose Features

Lock in your clients

Fill your classes, increase revenue, and take training to the next level by offering FitFighter classes and sports-specific training with minimal spatial footprint.

The Safest Training System

Stable when used dynamically and pliable to prevent injury from accidental drops or slips.

Innovative Training System

5-in-1 tool with limitless applications to lift, swing, toss, drag, and drop .

Get Certified with CEUS

Grab your team and get certified with our FitFighter Pro Level 1 Pro Certification Course.

Trusted by the Best

Tried, tested, and relied upon by the fire service, gym owners, tactical units, and public safety organizations nationwide.

30-Day Programs

Build Strength Improve Mobility Prevent Injury Boost Endurance

Sports & Lifestyle Programs



60+ Fitness

60+ Fitness





Need more Steelhoses?

Ready to move up to a higher weight hose or purchase more hoses for your athletes, clients or patients?

Shop now
See our Tactical Training series of classes

Featured Program:
30-Day Tactical Training

Trusted by tactical units, strength coaches and trainers across the country. Protect your athletes, build client loyalty, and grow your business.

Get Certified

Quick Start

Quick Start

Level One Certification

Level One Certification

Pro Reviews

When I was first introduced to the Steelhose and SIRT System, I knew it would be a great addition to our functional programs at Triplex Training, but I had no idea how broad the benefits would be. The versatility of this training allows our athletes to carry, throw, drag, and lift without concern for safety or durability. This new category of strength programming allows us to work proprioception, grip strength, and hand-eye coordination in our athletes in addition to strength, power, conditioning, mobility, double & single leg stability, and agility. This is also the only strength and mobility system we can use easily in large groups and teams which adds whole new dimensions to training opportunities. With our focus on training movement versus individual muscles, the Steelhose has allowed us to promote core strength by using full body imbalanced exercises in our circuits and team training. FitFighter has been an excellent addition to every single athlete that comes through our doors. I can't imagine not having it as a standard component in our programs.
Kyle Herrig
FitFighter is a superior concept for the novice to the Pro. What an amazing training system. SIRT Training will get your clients sweating, moving and training like a champion. The FitFighter platform is easy to use, clear with movement libraries and versatile program options. The next level of strength, conditioning, and mobility training is here.
Lori Sawyer
CSCS, Former USC Strength Coach, Clean Cut Fitness and Nutrition
I love the function, versatility, and purpose of the SIRT System. Not only that, Steelhoses are high quality, well made and durable. They add to your toolbox of training the whole body in countless ways and have been invaluable for peak performance in my athletes and clients. I use these on the beach, in the gym, and in the weight room to create the ultimate workout for myself and my athletes. I highly suggest adding them to your training programs, and considering FitFighter’s Pro Programs as your SIRT Foundation.
Leslie Trujillo
The Developing Athlete Podcast and Youth Athlete Coach

Advisory Board

Sarah Apgar

Sarah Apgar, CPT, MBA

  • Founder and CEO
  • Army / Iraq War Veteran
  • All-American Collegiate Rugby
  • MBA Dartmouth
  • ROTC Princeton
Jason Walsh

Jason Walsh, CSCS, NSCA-CPT

  • Partner
  • CEO, Rise Nation & Rise Movement
  • Pro Athlete
  • Celebrity Coach
Amber Goppert

Amber Goppert, CSCS

  • Director - Training and Education
  • Owner, The Training Room
  • Former NIKE Trainer
Todd Durkin

Todd Durkin, CSCS, MA

  • Advisor
  • Owner, Fitness Quest 10
  • Under Armour Lead Training Advisor
Dr. Steve Sundarraj

Dr. Steve Sundarraj, DPT

  • Advisor
  • Owner, Recalibrate PT
  • MMA Athlete Trainer
Josh Stolz

Josh Stolz, CSCS

  • Master Instructor
  • Head of Pro Accounts
  • Former Equinox Master Trainer

The Coaches

Carrie S. Armacost

Carrie S. Armacost, ACE-CPT

  • TPI Level 2
  • Owner, CareFit Personal Training
  • Endurace Sports Athlete
Derith Cass

Derith Cass, CSCS

  • Coach, Fierce by Choice
Geraldine Dry

Geraldine Dry

  • BS, Health Science
  • USAW-SPC Level 1
  • DBC Level 1
  • FMS Level 1
Kate Langinauer

Kate Langinauer

  • MA Psychology
  • Certified Personal Trainer
  • Health Coach and Fitness Coach
  • Entrepreneur
Dan Lawrence

Dan Lawrence, CSCS, ACE CPT, RKC II

  • Owner, The Readiness Training
  • On Camera Coach - The Daily Burn / MYX Fitness
Jose Mendoza

Jose Mendoza, ACSM-PT

  • Founder, Jam Fit Personal Training
Mike Morrison

Mike Morrison

  • Master Instructor
  • MS Kinesiology
  • USAW and Bioforce Certified
Philip Ritchy

Philip Ritchy

  • Founder, Tops Fitness Management
  • Affiliate owner, Rock Steady Boxing
Alyssa Shoji

Alyssa Shoji, NASM-CPT, CES

  • Former Athlete and Fitness Professional
Matt Thomas

Matt Thomas

  • Champion Chess Boxer
  • Founder, Brawl for a Cause
  • Founder, Fight and Flow
  • Philanthropist
Fit Fighter Founder

From the Founder

FitFighter began 7 years ago as a simple solution for better movement and superior strength for first responders. In the firehouse we worked together as a team to optimize our skills through the use of Steelhoses as imbalanced weight load, and ultimately reimagined our approach to strength and conditioning entirely. We taught skills by teaching movement. We changed the way we moved and trained, and built a new kind of strength. We improved performance and work capacity by increasing the efficiency of that strength. Now my team has infused those same science-based principles into our SIRT System, our proprietary training platform for trainers, coaches, athletes, and the general public. Join me and my team in the most focused, energetic, joy-filled, high performance training experiences in the world. We're here to make you, your athletes, clients, members and teams mission ready, and to unite all of us, no matter who we are or where we come from, in this movement ethos, and mission readiness, of the future.

Partners and Affiliates

Top Fitness Management
Carefit Personal Training
Fire Department City of New York
Fitness Quest 10
Rise Nation
City of San Diego Fire Rescue
World Gym
Peak Fitness NW

Take Training to the Next Level

SIRT - Steelhose Instability Resistance Training