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 Nov 26estimated, may change
Remanufactured
Nautilus Nitro Plus Leg Extension
$2,495.00
$1,996.00
Save $499.00
Use code
at checkout
4.8
ConditionRemanufactured
Availability
Only 1 left in stock
Pay over timeBusiness financing
Business financing from $…/mo*
*Estimate, subject to credit approval.
Parts & Labor, Fully Rebuilt
Remanufactured to full mechanical spec, covered from the day it lands.
Bars, handles and straps shown in photos are not always included. Check the description, or add attachments to your order.
Shipping calculator
Enter your state and ZIP code to see delivery options and prices.
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: Nov 26
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: 55" × 36" × 54" tall
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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Added as separate lines on your order.
Customer reviews
Real Gyms. Real People.
See why gym owners and home gym builders trust Build A Gym with their gyms.
4.8
★★★★★
277 reviews on Google
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a month ago
★★★★★
Great communication, products, and I'm very happy with what I purchased from them. I will be back!
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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!!
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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!
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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.
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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.
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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!
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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!
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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!
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4 months ago
★★★★★
Excellent selection of products with a large selection, consultants will help you decide
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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!
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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.
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5 months ago
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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
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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.
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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.
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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!!
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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!!!
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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.
-
Wear parts replaced
Belts, cables, bearings, bushings, grips and safety-critical hardware are replaced as standard, whether or not they still have life in them.
-
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
Same shop, same process
Every machine we sell goes through the same shop as this Life Fitness Signature Series Hip Abduction, photographed recently in Texas.
- Model shown
- Life Fitness Signature Series Hip Abduction
- Stage
- Palletized
- Photographed
- Oct 27, 2026
- Where
- Our shop in Texas
- Headed to
- Florida
- Wrapped by
Rob G.
- Inspected frame to console, then fully disassembled
- Belts, cables, bearings and grips replaced as standard
- Tested under load before it ships
This photo shows a Life Fitness Signature Series Hip Abduction, 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.
The Nautilus Nitro Leg Extension delivers full knee extension quadriceps training with proper axis alignment throughout the movement, classic variable resistance cams for smooth consistent loading, quick-set leg pad, heavily padded movement arm roller, Ergo Grip® handles, partially shielded 245 lb weight stack with 5 lb increments, and 2"×4" steel frame - 557 lb commercial frame, 55"×36" footprint. The Nautilus Nitro Leg Extension is the commercial-grade counterpart to the Precor C-Line, S-Line, and Discovery leg extensions in the catalog - each built for the same quad isolation objective with different frame lineages and design details. The variable resistance cam is the engineering specification that distinguishes a biomechanically engineered leg extension from a fixed-resistance machine: a standard weight stack connected through a simple pulley applies the same force throughout the arc regardless of where the knee is in its extension range. The problem is that the quadriceps do not have uniform strength through the full knee extension range - they are strongest at approximately 60° to 80° of knee flexion and weaker at full extension (0°) and at deep flexion approaching 90°+. A fixed resistance is either too heavy at the weak points of the arc or too light at the strong point. The variable resistance cam is shaped to vary the mechanical advantage of the lever system through the arc - increasing resistance where the quads are strongest and decreasing it where they are weakest - so the loading matches the muscle's actual force production capacity at each point in the range. The result is that the muscle works near its capacity through the entire arc rather than being limited by the weakest point. The quick-set leg pad allows rapid repositioning between users without tool-free adjustment delays - relevant in commercial environments with high user rotation. The 5 lb weight stack increments are finer than the standard 10 lb increments on many machines, allowing more precise load progression.
Ergo Grip® handles for stability throughout the extension arc. Traditional seat pads for familiar comfort. Partially shielded stack for clean aesthetics and accessible weight selection. 557 lb Nautilus Nitro commercial frame, 55"×36" footprint. Remanufactured.
Primary muscles targeted
Rectus Femoris Vastus Lateralis Vastus Medialis Vastus Intermedius
Secondary muscles
Tibialis Anterior
Key features
Variable Resistance Cams · Axis Alignment - Load Matched to Quad Strength Curve
Classic variable resistance cams vary the mechanical advantage of the lever through the extension arc - increasing resistance at the quads' strongest range (60° to 80° of knee flexion) and reducing it where they are weakest (full extension and deep flexion). A fixed resistance machine is limited by the arc's weakest point; the cam ensures the muscle works near capacity throughout the full range. Proper axis alignment through the movement eliminates off-axis shear at the knee joint on every repetition.
Quick-Set Pad · 245 lb Stack · 5 lb Increments · Ergo Grip® Handles
Quick-set leg pad repositions without tools for fast user changeover in commercial rotation. 245 lb weight stack with 5 lb increments - finer than the standard 10 lb increments on many machines - for more precise load progression and easier micro-loading between training cycles. Ergo Grip® handles provide stability and bracing throughout the extension arc. Heavily padded movement arm roller for comfort during heavy sets.
Specifications
Dimensions (L × W × H)
55" × 36" × 54"
Machine Weight
557 lb
Weight Stack
245 lb
5 lb increments · Variable resistance cams · Quick-set pad · Ergo Grip®
Design
Var. Cam · 245 lb · 5 lb Inc. · Quick-Set · 557 lb
Variable resistance cams · Proper axis alignment · Quick-set leg pad · 245 lb stack · 5 lb increments · Heavily padded arm roller · Ergo Grip® handles · 2"×4" steel frame · 557 lb · 55"×36" footprint
1. What are the exact dimensions and footprint of this Nautilus Nitro Plus Leg Extension?
This machine measures 55 inches front to back, 36 inches wide, and 54 inches high, with a 14 square foot footprint. You may want to allow extra clearance for user access and movement.
2. How much weight does the stack provide and in what increments?
The weight stack offers up to 245 pounds, adjustable in 5 pound increments for precise load progression.
3. What muscles does this machine target and how does it optimize training?
It primarily targets the quadriceps, using a variable resistance cam to match resistance to the muscle's strength curve throughout the extension arc.
4. What is the condition of this machine and what does remanufactured mean?
This is a remanufactured unit, meaning it was previously owned commercial equipment that has been fully disassembled, cleaned, repaired, and quality tested in our Texas shop. Cosmetic marks from prior use may remain.
5. What warranty coverage comes with this remanufactured machine?
It includes a 1-year parts and labor warranty from the delivery date. Extended coverage is available with BAG Care+ on the product page.
6. What delivery options are available for this equipment?
You can choose Driveway Freight Delivery or Inside Delivery & Assembly at checkout. Stairs require a separate quote and the shipping calculator on the page will show your freight price.
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 Nautilus Nitro Leg Extension delivers full knee extension quadriceps training with proper axis alignment throughout the movement, classic variable resistance cams for smooth consistent loading, quick-set leg pad, heavily padded movement arm roller, Ergo Grip® handles, partially shielded 245 lb weight stack with 5 lb increments, and 2"×4" steel frame - 557 lb commercial frame, 55"×36" footprint. The Nautilus Nitro Leg Extension is the commercial-grade counterpart to the Precor C-Line, S-Line, and Discovery leg extensions in the catalog - each built for the same quad isolation objective with different frame lineages and design details. The variable resistance cam is the engineering specification that distinguishes a biomechanically engineered leg extension from a fixed-resistance machine: a standard weight stack connected through a simple pulley applies the same force throughout the arc regardless of where the knee is in its extension range. The problem is that the quadriceps do not have uniform strength through the full knee extension range - they are strongest at approximately 60° to 80° of knee flexion and weaker at full extension (0°) and at deep flexion approaching 90°+. A fixed resistance is either too heavy at the weak points of the arc or too light at the strong point. The variable resistance cam is shaped to vary the mechanical advantage of the lever system through the arc - increasing resistance where the quads are strongest and decreasing it where they are weakest - so the loading matches the muscle's actual force production capacity at each point in the range. The result is that the muscle works near its capacity through the entire arc rather than being limited by the weakest point. The quick-set leg pad allows rapid repositioning between users without tool-free adjustment delays - relevant in commercial environments with high user rotation. The 5 lb weight stack increments are finer than the standard 10 lb increments on many machines, allowing more precise load progression.
Ergo Grip® handles for stability throughout the extension arc. Traditional seat pads for familiar comfort. Partially shielded stack for clean aesthetics and accessible weight selection. 557 lb Nautilus Nitro commercial frame, 55"×36" footprint. Remanufactured.
Primary muscles targeted
Rectus Femoris Vastus Lateralis Vastus Medialis Vastus Intermedius
Secondary muscles
Tibialis Anterior
Key features
Variable Resistance Cams · Axis Alignment - Load Matched to Quad Strength Curve
Classic variable resistance cams vary the mechanical advantage of the lever through the extension arc - increasing resistance at the quads' strongest range (60° to 80° of knee flexion) and reducing it where they are weakest (full extension and deep flexion). A fixed resistance machine is limited by the arc's weakest point; the cam ensures the muscle works near capacity throughout the full range. Proper axis alignment through the movement eliminates off-axis shear at the knee joint on every repetition.
Quick-Set Pad · 245 lb Stack · 5 lb Increments · Ergo Grip® Handles
Quick-set leg pad repositions without tools for fast user changeover in commercial rotation. 245 lb weight stack with 5 lb increments - finer than the standard 10 lb increments on many machines - for more precise load progression and easier micro-loading between training cycles. Ergo Grip® handles provide stability and bracing throughout the extension arc. Heavily padded movement arm roller for comfort during heavy sets.
Specifications
Dimensions (L × W × H)
55" × 36" × 54"
Machine Weight
557 lb
Weight Stack
245 lb
5 lb increments · Variable resistance cams · Quick-set pad · Ergo Grip®
Design
Var. Cam · 245 lb · 5 lb Inc. · Quick-Set · 557 lb
Variable resistance cams · Proper axis alignment · Quick-set leg pad · 245 lb stack · 5 lb increments · Heavily padded arm roller · Ergo Grip® handles · 2"×4" steel frame · 557 lb · 55"×36" footprint
1. What are the exact dimensions and footprint of this Nautilus Nitro Plus Leg Extension?
This machine measures 55 inches front to back, 36 inches wide, and 54 inches high, with a 14 square foot footprint. You may want to allow extra clearance for user access and movement.
2. How much weight does the stack provide and in what increments?
The weight stack offers up to 245 pounds, adjustable in 5 pound increments for precise load progression.
3. What muscles does this machine target and how does it optimize training?
It primarily targets the quadriceps, using a variable resistance cam to match resistance to the muscle's strength curve throughout the extension arc.
4. What is the condition of this machine and what does remanufactured mean?
This is a remanufactured unit, meaning it was previously owned commercial equipment that has been fully disassembled, cleaned, repaired, and quality tested in our Texas shop. Cosmetic marks from prior use may remain.
5. What warranty coverage comes with this remanufactured machine?
It includes a 1-year parts and labor warranty from the delivery date. Extended coverage is available with BAG Care+ on the product page.
6. What delivery options are available for this equipment?
You can choose Driveway Freight Delivery or Inside Delivery & Assembly at checkout. Stairs require a separate quote and the shipping calculator on the page will show your freight price.
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.
$2,495.00
This machine
Bundle total
- Items
- $5,065.00
- Bundle price
- $4,811.75
- Estimated bundle saving
- −$253.25
- Everything arrives by
- Nov 26
One freight booking, one delivery window, one crew. Inside Delivery & Assembly available on the whole bundle.