Parcel ground shipping
Items weighing 149 lb or less ship by ground parcel rather than freight.
Receive by Nov 4estimated, may change
New
BUILT Strength Infinite Series Back Extension
$3,295.00
4.8
ConditionNew
Availability
Only 1 left in stock
Pay over timeBusiness financing
Business financing from $…/mo*
*Estimate, subject to credit approval.
Parts & Labor, Plus Lifetime Frame
New equipment. Coverage starts on the date of delivery.
Shipping calculator
Enter your state and ZIP code to see delivery options and prices.
Machine overview
Condition: New
Warranty: 1 Year Parts & Labor (Extended Available)
Returns: 30-Day Returns & Exchanges
Shipping: Driveway Delivery, or Inside Delivery & Assembly
Receive by: Nov 4
How It Ships: Crated w/ Assembly Manual
Delivery options
How delivery works
Your item’s shipping method and price are confirmed in the shipping calculator and at checkout. Here is what each delivery path means.
Driveway freight delivery
Your equipment is palletized and protected. The freight carrier schedules delivery, then uses a liftgate to lower it to your curb or driveway. Moving it inside and unpacking it are up to you.
Inside delivery & assembly
When selected and available for your address, the delivery team brings the equipment into the room, assembles and tests it, then removes the packaging.
Full truckload
For commercial builds and multi-pallet orders, a dedicated trailer keeps the full order together in one delivery. We confirm the unloading plan before the truck ships.
Size: 48" × 39" × 62" tall
What New Means
Brand new, current-model equipment shipped in the factory crate with the full manufacturer warranty. Extended coverage is available at checkout.
Warranty Coverage
New and remanufactured equipment are both covered for one year, parts and labor, backed by us. Extended protection is available on either through BAG Care+. Used equipment is sold as-is with no warranty coverage, and is described honestly before you buy. We service nationwide - every ZIP code in the country - so coverage travels with the machine.
30-Day Returns & Exchanges
Change your mind within 30 days of delivery and you can return the machine or exchange it for a different size, color or configuration.
Return shipping is the customer's responsibility and a 15% restocking fee applies to preference returns and exchanges. Freight items must go back packaged to the same standard they arrived in. We will tell you exactly what that means before anything is collected.
Anything that arrives damaged or fails under warranty is handled separately and carries no restocking fee. Full terms are in our Returns, Exchange & Refund Policy.
Add before it ships
Before the freight bookingCoverage and accessories have to go on the same booking as the machine. Add them here and they travel together.
Extended warrantyRecommendedEvery machine includes 1 year parts and labor.
Pairs well with this
Nothing selected yet
Added as separate lines on your order.
Build A Gym
-
a month ago
★★★★★
Great communication, products, and I'm very happy with what I purchased from them. I will be back!
Read on Google -
a month ago
★★★★★
Just want to say thank you to the team at CTX!! Not only was shipping fast and efficient, but customer service was outstanding!! Any question that was needed to be answered was meet with a quick response. Thank you again!!
Read on Google -
a month ago
★★★★★
Dillon was very helpful, patient with answering all my questions, very knowledgeable. He insured I had all the necessary answers before I made my purchase. Thanks Dillon, great customer service!
Read on Google -
2 months ago
★★★★★
I was thinking about getting Ozempic, but I’m not in the mood to go blind yet. So I decided I’d do it the old fashioned way and called CTX.
Read on Google -
2 months ago
★★★★★
CTX Built is a great company to work with. Excellent communication and customer service. Their team was easy to work with and extremely helpful. Would do more business with them and I plan to.
Read on Google -
2 months ago
★★★★★
CTX stands by their products. I recently purchased a Precor elliptical from them & it arrived with a mechanical flaw. They coordinated with a technician to get my product fixed like new. They accomplished this despite the fact that my home was two states away. Special thank you to Nichole for staying accessible and attentive throughout the process!
Read on Google -
2 months ago
★★★★★
Great product and awesome leadership. Equipment was straight forward to build and team is always responsive when needing information or any help whatsoever. So glad I found them for outfitting my gym, best decision I have ever made for my business!
Read on Google -
2 months ago
★★★★★
Absolutely best in business! Not only is Dillon just genuinely a great human being, he’s real and honest. Loved everything I’ve gotten from him and the team. I’m about 10-15 pieces in deep with him and not stopping anytime soon! Absolutely recommend hitting these guys up for home/commercial equipment. New or refurbished!
Read on Google -
4 months ago
★★★★★
Excellent selection of products with a large selection, consultants will help you decide
Read on Google -
4 months ago
★★★★★
Dillion was great to work with!! Super friendly, quick turn around time, and great at communicating! The guys who delivered it Robb and JJ were also amazing. They came prepared and were very fast and efficient. They offered to help us move around other equipment to ensure we loved our gym! Super nice people and an amazing company! I would highly recommend working with them. Oh and the equipment itself is high quality and looks great in our home gym!
Read on Google -
5 months ago
★★★★★
I inquired to sell a few machines from my personal training studio. From beginning to the end, customer service was great! CTX was very quick with responses and communication was there! I very much will take my business back to CTX, and I highly recommend them.
Read on Google -
5 months ago
★★★★★
Bought this refurbished Matrix Stair mill and from the minute I mesaged about it they offered great communication and shipping was perfectly coordinated! Highly recommend this CTX Gym
Read on Google -
5 months ago
★★★★★
We purchased a Woodway treadmill from CTX Home Gyms and had a warranty issue a few months later. Dylan and his team were quick to respond, communicated throughout the process, and got everything resolved right away. Great customer service — highly recommend this company.
Read on Google -
5 months ago
★★★★★
I can’t say enough great things about CTX Home Gyms. They did an incredible job on both my commercial gym and my home gym setup. The entire process was seamless from beginning to end — professional communication, top-quality equipment, attention to detail, and outstanding customer service.
Read on Google
They truly know fitness equipment and how to create a space that looks amazing and functions at a high level. Whether you’re building a home gym or a full commercial facility, I highly recommend CTX Home Gyms. They made the entire experience easy, stress-free, and exceeded every expectation. -
5 months ago
★★★★★
Dillon and his team outfitted my entire new gym. We worked together from the beginning stages. They had the same exact vision I had. They did everything possible to make our dream gym. And they did!!
Read on Google
The entire experience was amazing. I literally told them what I wanted and they made it even better. The Build line is amazing. I get compliments on it daily. From the stitching on the equipment to how smooth it is. I can not say enough good things about it. And the plate loaded build equipment is legit. I’m an equipment snob. I love finding the old pieces. But this stuff is even better. Pure quality and can stand some big weights!
We plan on opening a couple more gyms, and we are definitely usi -
6 months ago
★★★★★
Great company, Excellent Attention to Detail, Very Good Customer Service & the Price is Right!!!
Read on Google
Our own equipment line
What BUILT Strength is
Commercial-grade gear we design, stock and stand behind, sold only through Build A Gym.
-
Heavy commercial steel
Frames are laser-cut and welded from heavy-gauge steel, built for daily commercial use.
-
We audit the factory’s work
Our team audits the factory regularly, checking machines, welds and finishes before they ship to Texas.
-
Stocked in Texas
Most of the range ships from our Jarrell, TX warehouse. Try it first at our Georgetown showroom.
-
Delivered and backed for life
1 year parts and labor plus lifetime frame coverage. Add inside delivery and assembly at checkout.
Product details
Commercial-grade equipment, inspected and supported by warranty.
The Infinite Series Back Extension pairs a fixed 45-degree platform with a 200 lb selectorized stack, so you can load the posterior chain far past bodyweight without waiting on plates. Adjustable-height thigh pads set the pivot at the hips for a clean hinge, while quilted leg rollers and thigh pads keep you locked in through every rep.
A D-clip attachment point accepts multiple handle styles - a straight bar is included - for weighted extensions that scale with the athlete, and a bar catch at the bottom keeps the bar within reach between sets. Fixed handlebars at the thigh pads assist entry and exit, and the textured flat and angled platforms deliver no-slip traction on high-traffic commercial floors.
Primary muscles targeted
Erector Spinae Gluteus Maximus Hamstrings
Secondary muscles
Multifidus Quadratus Lumborum
Key features
200 lb selectorized stack
Pin-select resistance loads the posterior chain well beyond bodyweight for progressive strength work without swapping plates.
Adjustable thigh pads
Height-adjustable, quilted thigh pads and leg rollers set the hip pivot precisely and lock the lower body in for a clean hinge.
D-clip attachment system
Swap in multiple handle styles at the D-clip for loaded extensions - a straight bar is included - with a bar catch that keeps it within reach between sets.
No-slip textured platforms
Sturdy flat and fixed angled platforms with textured surfaces deliver secure footing, and fixed handlebars assist safe entry and exit.
Specifications
Dimensions (L × W × H)
48" × 39" × 62"
1219 × 991 × 1575 mm
Weight stack
200 lb
91 kg selectorized
Resistance type
Pin-select stack
Incremental weight changes
Thigh pads
Height adjustable
Quilted pads & leg rollers
Attachments
D-clip · straight bar included
Accepts multiple handle styles · bar catch at base
Frame
11-Gauge (3mm) Steel
1. What are the exact dimensions and footprint of this back extension machine?
This machine measures 48 inches front to back, 39 inches wide, and 62 inches tall, with a 13 square foot footprint. Allowing extra clearance around the machine is suggested for safe and comfortable use.
2. What type of resistance does this machine use and how much weight can it provide?
It uses a 200 lb selectorized weight stack with pin-select resistance, so you can adjust the load without adding or removing plates.
3. Which muscles does this back extension specifically target?
It primarily targets the erector spinae, gluteus maximus, and hamstrings, with secondary emphasis on the multifidus and quadratus lumborum.
4. What attachments or handle options come with this machine?
A straight bar is included and attaches via a D-clip system, which also allows you to use other compatible handle styles if desired.
5. What warranty comes with this new machine?
New machines are covered by the manufacturer's warranty from BUILT Strength, and you can find more details on our product guarantees page.
6. What delivery options are available for this machine?
You can choose Driveway Freight Delivery or Inside Delivery & Assembly at checkout, with stairs quoted separately. The estimated receive-by date is shown on the product page.
30-Day Returns & Exchanges
Buy with confidence. Every Build A Gym order includes a 30-day window to return or exchange, whether you want a different size, color or configuration. Return shipping is the customer's responsibility and a 15% restocking fee applies to preference returns; warranty and damage claims carry no restocking fee. Full details in our Returns, Exchange & Refund Policy.
The Infinite Series Back Extension pairs a fixed 45-degree platform with a 200 lb selectorized stack, so you can load the posterior chain far past bodyweight without waiting on plates. Adjustable-height thigh pads set the pivot at the hips for a clean hinge, while quilted leg rollers and thigh pads keep you locked in through every rep.
A D-clip attachment point accepts multiple handle styles - a straight bar is included - for weighted extensions that scale with the athlete, and a bar catch at the bottom keeps the bar within reach between sets. Fixed handlebars at the thigh pads assist entry and exit, and the textured flat and angled platforms deliver no-slip traction on high-traffic commercial floors.
Primary muscles targeted
Erector Spinae Gluteus Maximus Hamstrings
Secondary muscles
Multifidus Quadratus Lumborum
Key features
200 lb selectorized stack
Pin-select resistance loads the posterior chain well beyond bodyweight for progressive strength work without swapping plates.
Adjustable thigh pads
Height-adjustable, quilted thigh pads and leg rollers set the hip pivot precisely and lock the lower body in for a clean hinge.
D-clip attachment system
Swap in multiple handle styles at the D-clip for loaded extensions - a straight bar is included - with a bar catch that keeps it within reach between sets.
No-slip textured platforms
Sturdy flat and fixed angled platforms with textured surfaces deliver secure footing, and fixed handlebars assist safe entry and exit.
Specifications
Dimensions (L × W × H)
48" × 39" × 62"
1219 × 991 × 1575 mm
Weight stack
200 lb
91 kg selectorized
Resistance type
Pin-select stack
Incremental weight changes
Thigh pads
Height adjustable
Quilted pads & leg rollers
Attachments
D-clip · straight bar included
Accepts multiple handle styles · bar catch at base
Frame
11-Gauge (3mm) Steel
1. What are the exact dimensions and footprint of this back extension machine?
This machine measures 48 inches front to back, 39 inches wide, and 62 inches tall, with a 13 square foot footprint. Allowing extra clearance around the machine is suggested for safe and comfortable use.
2. What type of resistance does this machine use and how much weight can it provide?
It uses a 200 lb selectorized weight stack with pin-select resistance, so you can adjust the load without adding or removing plates.
3. Which muscles does this back extension specifically target?
It primarily targets the erector spinae, gluteus maximus, and hamstrings, with secondary emphasis on the multifidus and quadratus lumborum.
4. What attachments or handle options come with this machine?
A straight bar is included and attaches via a D-clip system, which also allows you to use other compatible handle styles if desired.
5. What warranty comes with this new machine?
New machines are covered by the manufacturer's warranty from BUILT Strength, and you can find more details on our product guarantees page.
6. What delivery options are available for this machine?
You can choose Driveway Freight Delivery or Inside Delivery & Assembly at checkout, with stairs quoted separately. The estimated receive-by date is shown on the product page.
30-Day Returns & Exchanges
Buy with confidence. Every Build A Gym order includes a 30-day window to return or exchange, whether you want a different size, color or configuration. Return shipping is the customer's responsibility and a 15% restocking fee applies to preference returns; warranty and damage claims carry no restocking fee. Full details in our Returns, Exchange & Refund Policy.
Save 5%
Complete the room
The machines our install crew puts in the same room as this one - priced as one shipment, delivered in one booking.
$3,295.00
This machine
Bundle total
- Items
- $5,865.00
- Bundle price
- $5,571.75
- Estimated bundle saving
- −$293.25
- Everything arrives by
- Nov 4
One freight booking, one delivery window, one crew. Inside Delivery & Assembly available on the whole bundle.