Parcel ground shipping
Items weighing 149 lb or less ship by ground parcel rather than freight.
Bars, handles and straps shown in photos are not always included. Check the description, or add attachments to your order.
Receive by Dec 10estimated, may change
Remanufactured
Hammer Strength Select Back Extension
295 lb weight stack
A rare stack size for selectorized machines
$1,995.00
$1,596.00
Save $399.00
Use code
at checkout
4.8
ConditionRemanufactured
Availability
Out of Stock
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See similar machines in stock →Parts & Labor, Fully Rebuilt
Remanufactured to full mechanical spec, covered from the day it lands. Wear items are not covered.
Bars, handles and straps shown in photos are not always included. Check the description, or add attachments to your order.
Shipping calculator
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Machine overview
Condition: Remanufactured
Warranty: 1 Year Parts & Labor (Extended Available)
Returns: 30-Day Returns & Exchanges
Shipping: Driveway Delivery, or Inside Delivery & Assembly
Receive by: Dec 10
How It Ships: Fully Assembled
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: 46" × 40" × 55" tall
Weight Stack: 295 lb
What Remanufactured Means
Every remanufactured machine is fully disassembled, deep cleaned, repaired or re-parted to factory spec, then tested under load before it ships. Backed by one year parts and labor, with extended coverage available.
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.
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Customer reviews
Real Gyms. Real People.
See why gym owners and home gym builders trust Build A Gym with their gyms.
4.8
★★★★★
280 reviews on Google
Write a review
-
2 days ago
★★★★★
CTX/ Build-a-Gym absolutely CRUSHED IT! I had been struggling with numerous manufacturers trying to get a seated leg press/extension that’d ship to Alaska. When I found CTX, they went above and beyond to get my Fractal packaged and shipped with no hassle. I HIGHLY recommend these folks to anyone looking for solid commercial quality equipment for their home.
Read on Google
Thank you guys!!! -
6 days ago
★★★★★
I own a gym in Northern California and have ordered from this company many times, they are quality! Great deals, great communication, great products!
Read on Google -
2 weeks ago
★★★★★
Nicole was extremely helpful, communication was tops, takes care of business. Thank you!
Read on Google -
4 weeks ago
★★★★★
Equipment is awesome. Delivered and setup in the garage. Will be going back for more
Read on Google -
4 weeks ago
★★★★★
By far the best equipment I’ve had and very reliable for my home and it’s also for a commercial gym also I have The Zaia
Read on Google -
a month ago
★★★★★
Had some issues with the assembly process. Dillan was quick to reach out and set up a video call for assistance. He provided follow ups to ensure everything was squared away. Great customer service!
Read on Google -
a month ago
★★★★★
Great communication, products, and I'm very happy with what I purchased from them. I will be back!
Read on Google -
2 months 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 -
2 months 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 -
3 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 -
3 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 -
3 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 -
3 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 -
3 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 -
5 months ago
★★★★★
Excellent selection of products with a large selection, consultants will help you decide
Read on Google -
5 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
Rebuilt in our Jarrell, TX shop
What remanufactured means here
Every machine we sell as remanufactured goes through the same process, whatever the brand or the price. Not a wipe-down and a price tag.
-
Inspected and stripped down
Assessed frame to console, then taken apart and checked part by part. Nothing gets judged from the outside.
-
Moving parts rebuilt or replaced
Every moving and touched component, from belts and cables to bearings, bushings and grips, is evaluated and rebuilt or replaced, then the machine gets a full cosmetic restoration.
-
Refinished and rebuilt to spec
Electronics bench-tested, frames and welds checked, panels refinished, then reassembled to the manufacturer's specification.
-
Tested under load
A full operational cycle under load before it ships. Anything that fails the final check goes back through service, not onto a truck.
Get an email when new machines land
Good units go fast. We'll email you when new machines land - nothing else.
Shop photo
Real photo, similar machine
From our shop: Hammer Strength Select
A Hammer Strength Select Assist Dip / Chin from the same series, photographed mid-remanufacture in our Texas shop. This model goes through the same process.
- Model shown
- Hammer Strength Select Assist Dip / Chin
- Stage
- On the bench
- Photographed
- Nov 2, 2026
- Where
- Our shop in Texas
- Headed to
- Rebuilt by
Rob L.
- Inspected frame to console, then fully disassembled
- Every moving and touched component rebuilt or replaced
- Full cosmetic restoration
- Tested under load before it ships
This photo shows a Hammer Strength Select Assist Dip / Chin, not this exact model. Every machine we sell goes through the same process.
See the full remanufacturing processProduct details
Commercial-grade equipment, inspected and supported by warranty.
Quick answer: The Hammer Strength Select Back Extension is a remanufactured commercial selectorized lower back machine. An ergonomically shaped lumbar pad is aligned to the axis of rotation so the lower back extends through the correct arc, a five-position start fits different torso lengths, and two non-slip foot platforms fit different leg lengths. It has a 295 lb stack, a 300 lb max user weight, measures 46 in. by 40 in. by 55 in., and weighs 560 lb.
The Hammer Strength Select Back Extension strengthens the posterior chain with a five-position adjustable start, ergonomically shaped lumbar pad aligned to the axis of rotation, two non-slip foot platforms, and a 295 lb selectorized stack - the lumbar pad's alignment to the rotation axis is the critical fit specification: it positions the user so the lower back extends through the correct arc rather than pivoting from the wrong point, which is what causes lumbar stress on improperly set back extension machines. The five-position start accommodates different torso lengths and range-of-motion preferences, and the two foot platform positions further expand the fit range across users of different leg lengths.
Smooth selectorized resistance covers rehabilitation through advanced lower back loading. 295 lb stack on a 560 lb commercial frame, 46" × 40" footprint, 300 lb max user. Remanufactured.
Primary muscles targeted
Erector Spinae Gluteus Maximus Hamstrings
Secondary muscles
Multifidus Adductors Core Stabilizers
Key features
Lumbar Pad Aligned to Rotation Axis - Correct Extension Arc
The ergonomically shaped lumbar pad is positioned in relation to the machine's rotation axis - ensuring the lower back extends through the correct arc rather than pivoting from the wrong point. Incorrect axis alignment on back extension machines is the primary cause of lumbar stress during the exercise, making this the most important fit variable on the machine.
5-Position Start · 2 Foot Platforms · 295 lb Stack
Five start positions accommodate different torso lengths and range-of-motion preferences. Two non-slip foot platforms expand the fit range across users of different leg lengths. 295 lb selectorized stack covers posterior chain training from rehabilitation through advanced progressive loading.
Specifications
Dimensions (L × W × H)
46" × 40" × 55"
Machine Weight
560 lb
Weight Stack
295 lb
Selectorized · 5-position start · 300 lb max user
Design
Axis-Aligned Pad · 5-Position · 295 lb · 560 lb
Lumbar pad aligned to rotation axis · 5-position start · 2 non-slip foot platforms · 295 lb selectorized · 300 lb max user · 560 lb commercial frame
Buyer questions
What muscles does the Hammer Strength back extension work?
Mainly the erector spinae, glutes, and hamstrings, with the multifidus, adductors, and core stabilizers assisting.
Why does the lumbar pad alignment matter?
The pad sits in line with the machine rotation axis, so the lower back extends through the correct arc instead of pivoting from the wrong point. The five start positions and two foot platforms let each user dial in that fit.
What warranty comes with this remanufactured machine?
Remanufactured units carry 1-year parts and labor coverage that starts on the delivery date. Register within 30 days of delivery, and see product guarantees for details.
How is it delivered?
It ships as commercial freight to the lower 48 under the delivery level you pick at checkout (curbside or inside delivery and assembly). Review delivery options and the shipping and installation checklist.
Related: back selectorized machines, Hammer Strength, remanufactured strength.
Owner
PDF
PDF
Owner's manual
Hammer Strength Select Back Extension
How to use it: the console, programs, adjustments and day-to-day care.
View manual
Download PDF
Rather not build it?
We will assemble it for you
Brought inside to the room you choose
Assembled and set up by our crew
Packaging taken away
Choose Inside Delivery & Assembly as your delivery option at checkout.
How assembly works
1. What are the exact dimensions and footprint of this back extension machine?
This machine measures 46 inches front to back, 40 inches wide, and 55 inches high, with a footprint of 13 square feet. Allowing extra clearance around the machine is suggested for safe and comfortable use.
2. What weight stack does it use and how is resistance adjusted?
It features a 295 lb selectorized weight stack, which you adjust easily using the selector pin.
3. Which muscles does this machine target and how does its design support proper form?
It primarily targets the erector spinae, gluteus maximus, and hamstrings. The lumbar pad is aligned to the machine's rotation axis, helping guide the lower back through the correct extension arc to reduce lumbar stress.
4. Who is this machine suitable for in terms of user size and adjustability?
It accommodates users up to 300 lb and offers a five-position adjustable start plus two foot platforms, fitting a wide range of torso and leg lengths.
5. What is the condition of this machine and what does remanufactured mean?
This is a remanufactured commercial machine, fully disassembled, cleaned, repaired, and tested in Texas. Cosmetic marks from prior use may remain, but it is certified for quality and function.
6. What warranty and delivery options are available for this machine?
Remanufactured machines come with a 1-year parts and labor warranty from delivery. Delivery options include curbside or inside assembly, with details and freight pricing shown at checkout.
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.
Quick answer: The Hammer Strength Select Back Extension is a remanufactured commercial selectorized lower back machine. An ergonomically shaped lumbar pad is aligned to the axis of rotation so the lower back extends through the correct arc, a five-position start fits different torso lengths, and two non-slip foot platforms fit different leg lengths. It has a 295 lb stack, a 300 lb max user weight, measures 46 in. by 40 in. by 55 in., and weighs 560 lb.
The Hammer Strength Select Back Extension strengthens the posterior chain with a five-position adjustable start, ergonomically shaped lumbar pad aligned to the axis of rotation, two non-slip foot platforms, and a 295 lb selectorized stack - the lumbar pad's alignment to the rotation axis is the critical fit specification: it positions the user so the lower back extends through the correct arc rather than pivoting from the wrong point, which is what causes lumbar stress on improperly set back extension machines. The five-position start accommodates different torso lengths and range-of-motion preferences, and the two foot platform positions further expand the fit range across users of different leg lengths.
Smooth selectorized resistance covers rehabilitation through advanced lower back loading. 295 lb stack on a 560 lb commercial frame, 46" × 40" footprint, 300 lb max user. Remanufactured.
Primary muscles targeted
Erector Spinae Gluteus Maximus Hamstrings
Secondary muscles
Multifidus Adductors Core Stabilizers
Key features
Lumbar Pad Aligned to Rotation Axis - Correct Extension Arc
The ergonomically shaped lumbar pad is positioned in relation to the machine's rotation axis - ensuring the lower back extends through the correct arc rather than pivoting from the wrong point. Incorrect axis alignment on back extension machines is the primary cause of lumbar stress during the exercise, making this the most important fit variable on the machine.
5-Position Start · 2 Foot Platforms · 295 lb Stack
Five start positions accommodate different torso lengths and range-of-motion preferences. Two non-slip foot platforms expand the fit range across users of different leg lengths. 295 lb selectorized stack covers posterior chain training from rehabilitation through advanced progressive loading.
Specifications
Dimensions (L × W × H)
46" × 40" × 55"
Machine Weight
560 lb
Weight Stack
295 lb
Selectorized · 5-position start · 300 lb max user
Design
Axis-Aligned Pad · 5-Position · 295 lb · 560 lb
Lumbar pad aligned to rotation axis · 5-position start · 2 non-slip foot platforms · 295 lb selectorized · 300 lb max user · 560 lb commercial frame
Buyer questions
What muscles does the Hammer Strength back extension work?
Mainly the erector spinae, glutes, and hamstrings, with the multifidus, adductors, and core stabilizers assisting.
Why does the lumbar pad alignment matter?
The pad sits in line with the machine rotation axis, so the lower back extends through the correct arc instead of pivoting from the wrong point. The five start positions and two foot platforms let each user dial in that fit.
What warranty comes with this remanufactured machine?
Remanufactured units carry 1-year parts and labor coverage that starts on the delivery date. Register within 30 days of delivery, and see product guarantees for details.
How is it delivered?
It ships as commercial freight to the lower 48 under the delivery level you pick at checkout (curbside or inside delivery and assembly). Review delivery options and the shipping and installation checklist.
Related: back selectorized machines, Hammer Strength, remanufactured strength.
Owner
PDF
PDF
Owner's manual
Hammer Strength Select Back Extension
How to use it: the console, programs, adjustments and day-to-day care.
View manual
Download PDF
Rather not build it?
We will assemble it for you
Brought inside to the room you choose
Assembled and set up by our crew
Packaging taken away
Choose Inside Delivery & Assembly as your delivery option at checkout.
How assembly works
1. What are the exact dimensions and footprint of this back extension machine?
This machine measures 46 inches front to back, 40 inches wide, and 55 inches high, with a footprint of 13 square feet. Allowing extra clearance around the machine is suggested for safe and comfortable use.
2. What weight stack does it use and how is resistance adjusted?
It features a 295 lb selectorized weight stack, which you adjust easily using the selector pin.
3. Which muscles does this machine target and how does its design support proper form?
It primarily targets the erector spinae, gluteus maximus, and hamstrings. The lumbar pad is aligned to the machine's rotation axis, helping guide the lower back through the correct extension arc to reduce lumbar stress.
4. Who is this machine suitable for in terms of user size and adjustability?
It accommodates users up to 300 lb and offers a five-position adjustable start plus two foot platforms, fitting a wide range of torso and leg lengths.
5. What is the condition of this machine and what does remanufactured mean?
This is a remanufactured commercial machine, fully disassembled, cleaned, repaired, and tested in Texas. Cosmetic marks from prior use may remain, but it is certified for quality and function.
6. What warranty and delivery options are available for this machine?
Remanufactured machines come with a 1-year parts and labor warranty from delivery. Delivery options include curbside or inside assembly, with details and freight pricing shown at checkout.
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.
$1,995.00
This machine
Bundle total
- Items
- $4,565.00
- Bundle price
- $4,336.75
- Estimated bundle saving
- −$228.25
- Everything arrives by
- Dec 10
One freight booking, one delivery window, one crew. Inside Delivery & Assembly available on the whole bundle.