Shawn Frankl

Big Iron Gym Mission Statement: 

We provide every person who steps inside our gym a home away from home and all are treated like family here.

We provide our members a professional facility, outfitted with a wide variety of workout equipment for all levels of fitness from beginner to professional athlete. 

We motivate and encourage our members to become the very best version of themselves, both physically and mentally.

We provide a positive, dedicated top-level workout environment grounded in Faith. We are here to serve God and serve others.

We adhere to the highest standards of excellence and integrity. We always put the needs of our members first and strive to continuously offer an asylum from everyday life through being part of the “Big Iron Family”.

Shawn Frankl


World Powerlifting Record Holder in the 198 & 220lb weight class Personal Bests at 198: 1055 squat, 825 bench, 750 deadlift total 2630 Personal Bests at 220: 1060 squat 875 bench 780 deadlift total 2715 Powerlifter, bodybuilder and coach

Liddy Ruden


B.A. Sports Science ACE Certified Personal Trainer x1 Physique Overall Winner x2 Figure Overall Winner x1 NPC National Competition Nutritional Consultant 10+ years in the Supplement Industry

Luke Dreier


Powerlifter BIG MEETS: 2x Arnold Classic, 2x Record Breakers in Cali 1x Kern USA Open Personal Bests: 815lb squat, 507 bench, 804 deadlift Specializing in kid/teen Strength

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Kellen Derynck


Part Time Trainer Full Time Firefighter UPA Judge Health Coach Specializing in the basic fundamentals of lifting

Laura Groseth



Past Events

Puppy and Kitty YOGA30 Oct 2022505 Chambers Street, Sioux City, IA, USA
PAIN SEMINAR26 Oct 2022505 Chambers Street, Sioux City, IA, USA
BIG IRON OPEN- Powerlifting Meet10 Sep 2022505 Chambers Street, Sioux City, IA, USA
CBD Seminar04 May 2022505 Chambers Street, Sioux City, IA, USA
Yoga for Beginners25 Apr 2022505 Chambers Street, Sioux City, IA, USA
Stretch Seminar24 Apr 2022505 Chambers Street, Sioux City, IA, USA


Become a part of something great, a family. Gym members get 24/7 key fob access Bathrooms, showers and lockers *Contact us today for pricing Information: Set up an appointment to check us out! Must be 18 to join *if under 18, parental/guardian signature is required.


One on one personal training with some of the best trainers in Sioux City. Trainers who have competed, who are certified and hold you accountable! From powerlifting, bodybuilding, strength and cond., weight loss, muscle gain and general health. We’ll get you connected with a trainer that fits your goals! *Contact us today for Personal Training pricing!


Proper nutrition is the foundation to reaching your goals. We have our trainers ready to get connected with YOU to achieve the best version of yourself! From general meal guidelines, counting macros and following a planned out “healthy eating” regimen that caters directly to you. Set up a time today! *$40 *Consultations last 30min-1 hour *No gym membership required for consult *contact


Protein Pre workouts Metabolism boosters Muscle Gainers Ready to go Drinks Stop in our shop and get hooked up with supplements that cater to your workouts and goals! With over 10 years of experience- we know what we’re talking about! Set up a time today or just stop in! *

If you would like to fill out membership application online, please click on the link below In order for your application to be approved, you must fill in all areas including the "bank" section with routing and account number (NO credit cards or debit cards) Please return completed membership form to We will contact you regarding payment info and App Access for the front door. You may also fill this out and bring in to sign up! Thanks Single Membership: $40/month +tax Spousal Membership: $65/month +tax Family Membership:$80/month +tax *All membership cancellations require 30 day notice*

  • 505 Chambers Street, Sioux City, Iowa, United States
  •  24/7 access STAFFED HOURS: Monday, Tuesday and Wednesday: 4-7pm Thursday, Friday: 3-7 Saturday: 12-4 *Stop in for a tour!*