Parcel ground shipping
Items weighing 149 lb or less ship by ground parcel rather than freight.
Receive by Oct 12
Remanufactured
Nautilus Nitro Plus Lower Back
$1,495.00
Save 62%
New retail $3,999 —
you save $2,504 buying remanufactured
Parts & Labor, Fully Rebuilt
Remanufactured to full mechanical spec, covered from the day it lands.
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: Oct 12
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: 56" × 38" × 54" tall
Financing: From $174.37/mo or 0% APR with
Check your purchasing powerWhat 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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Product details
Commercial-grade equipment, inspected and supported by warranty.
The Nautilus Nitro Plus Lower Back machine delivers seated lumbar extension with angled back pad and lumbar support for spinal alignment, adjustable range limiter for customized motion arc, smooth resistance system, gas-assisted seat adjustment, and commercial-grade Nautilus Nitro Plus construction — 572 lb frame, 56"×38" footprint. The lower back extension machine is the only dedicated lumbar isolation machine in the catalog — it targets the erector spinae group through a seated extension movement that no other selectorized machine replicates. The erector spinae are the primary muscles that hold the spine in extension against gravity during standing, walking, and most lifting activities — weakness in the lumbar erectors is the most common structural contributor to chronic lower back pain. Strengthening them in a controlled, supported range produces direct benefit for posture, lumbar stability, and injury prevention across both rehabilitation and performance populations. The seated lumbar extension machine is the appropriate tool for this because it isolates the erector spinae without requiring the hamstrings, glutes, or hip extensors to assist — which is what happens in standing deadlifts or back hyperextension on a GHD. The angled back pad and lumbar support position the spine at the correct starting angle for the extension movement, which ensures the force is directed through the erector spinae along their fiber orientation rather than producing shear force at the lumbar vertebrae. The adjustable range limiter is the safety specification that makes this machine appropriate for users with injury history or limited lumbar range: the limiter caps the extension arc at the user's comfortable range, preventing the movement from extending into the positions where disc or facet joint loading becomes counterproductive. Gas-assisted seat adjustment allows positioning without effort — relevant for users with pre-existing lower back pain for whom bending to adjust a mechanical seat would be contraindicated.
Smooth resistance system for joint-friendly lumbar loading. Commercial-grade build quality and upholstery for sustained high-rotation use. 572 lb Nautilus Nitro Plus commercial frame, 56"×38" footprint. Contact us for stack specifications. Remanufactured.
Primary muscles targeted
Erector Spinae Multifidus
Secondary muscles
Gluteus Maximus Quadratus Lumborum
Key features
Angled Back Pad · Adj. Range Limiter — Isolated Lumbar Loading, Controlled Arc
Angled back pad and lumbar support position the spine at the correct starting angle to direct force through the erector spinae along their fiber orientation rather than producing shear at the lumbar vertebrae. Adjustable range limiter caps the extension arc at the user's comfortable range — preventing the movement from extending into positions where disc or facet joint loading becomes counterproductive. The only selectorized machine in the catalog that isolates the lumbar erectors without hip extensor assistance.
Gas-Assisted Seat · Smooth Resistance · 572 lb Nitro Plus Frame
Gas-assisted seat adjustment allows positioning without bending effort — specifically relevant for users with pre-existing lower back pain for whom bending to adjust a mechanical seat would be contraindicated. Smooth resistance system for joint-friendly loading through the lumbar extension arc. 572 lb Nautilus Nitro Plus commercial frame with commercial-grade upholstery for sustained daily high-rotation use.
Specifications
Dimensions (L × W × H)
56" × 38" × 54"
Machine Weight
572 lb
Weight Stack
Contact Us
Angled back pad · Adj. range limiter · Gas-assisted seat · Smooth resistance
Design
Lumbar Ext. · Range Limiter · Gas Seat · 572 lb
Seated lumbar extension · Angled back pad · Lumbar support · Adjustable range limiter · Gas-assisted seat · Smooth resistance · Commercial upholstery · 572 lb · 56"×38" footprint
1. How do I select weight on a selectorized machine?
Insert the weight pin into the desired stack hole; ensure it clicks into place before use.
2. What weight stack size should I choose?
Most base level weight stacks can accommodate even advanced lifters, but for the real weight-movers, look for the items with expansion stacks.
3. What maintenance is required?
Inspect guide rods and stack alignment monthly; wipe rods and replace worn bushings annually.
4. Is installation available?
Yes—schedule professional installation during checkout for a seamless setup.
5. What warranty covers these machines?
New units carry full OEM coverage; remanufactured units include a 12 month Build A Gym Guarantee.
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 Plus Lower Back machine delivers seated lumbar extension with angled back pad and lumbar support for spinal alignment, adjustable range limiter for customized motion arc, smooth resistance system, gas-assisted seat adjustment, and commercial-grade Nautilus Nitro Plus construction — 572 lb frame, 56"×38" footprint. The lower back extension machine is the only dedicated lumbar isolation machine in the catalog — it targets the erector spinae group through a seated extension movement that no other selectorized machine replicates. The erector spinae are the primary muscles that hold the spine in extension against gravity during standing, walking, and most lifting activities — weakness in the lumbar erectors is the most common structural contributor to chronic lower back pain. Strengthening them in a controlled, supported range produces direct benefit for posture, lumbar stability, and injury prevention across both rehabilitation and performance populations. The seated lumbar extension machine is the appropriate tool for this because it isolates the erector spinae without requiring the hamstrings, glutes, or hip extensors to assist — which is what happens in standing deadlifts or back hyperextension on a GHD. The angled back pad and lumbar support position the spine at the correct starting angle for the extension movement, which ensures the force is directed through the erector spinae along their fiber orientation rather than producing shear force at the lumbar vertebrae. The adjustable range limiter is the safety specification that makes this machine appropriate for users with injury history or limited lumbar range: the limiter caps the extension arc at the user's comfortable range, preventing the movement from extending into the positions where disc or facet joint loading becomes counterproductive. Gas-assisted seat adjustment allows positioning without effort — relevant for users with pre-existing lower back pain for whom bending to adjust a mechanical seat would be contraindicated.
Smooth resistance system for joint-friendly lumbar loading. Commercial-grade build quality and upholstery for sustained high-rotation use. 572 lb Nautilus Nitro Plus commercial frame, 56"×38" footprint. Contact us for stack specifications. Remanufactured.
Primary muscles targeted
Erector Spinae Multifidus
Secondary muscles
Gluteus Maximus Quadratus Lumborum
Key features
Angled Back Pad · Adj. Range Limiter — Isolated Lumbar Loading, Controlled Arc
Angled back pad and lumbar support position the spine at the correct starting angle to direct force through the erector spinae along their fiber orientation rather than producing shear at the lumbar vertebrae. Adjustable range limiter caps the extension arc at the user's comfortable range — preventing the movement from extending into positions where disc or facet joint loading becomes counterproductive. The only selectorized machine in the catalog that isolates the lumbar erectors without hip extensor assistance.
Gas-Assisted Seat · Smooth Resistance · 572 lb Nitro Plus Frame
Gas-assisted seat adjustment allows positioning without bending effort — specifically relevant for users with pre-existing lower back pain for whom bending to adjust a mechanical seat would be contraindicated. Smooth resistance system for joint-friendly loading through the lumbar extension arc. 572 lb Nautilus Nitro Plus commercial frame with commercial-grade upholstery for sustained daily high-rotation use.
Specifications
Dimensions (L × W × H)
56" × 38" × 54"
Machine Weight
572 lb
Weight Stack
Contact Us
Angled back pad · Adj. range limiter · Gas-assisted seat · Smooth resistance
Design
Lumbar Ext. · Range Limiter · Gas Seat · 572 lb
Seated lumbar extension · Angled back pad · Lumbar support · Adjustable range limiter · Gas-assisted seat · Smooth resistance · Commercial upholstery · 572 lb · 56"×38" footprint
1. How do I select weight on a selectorized machine?
Insert the weight pin into the desired stack hole; ensure it clicks into place before use.
2. What weight stack size should I choose?
Most base level weight stacks can accommodate even advanced lifters, but for the real weight-movers, look for the items with expansion stacks.
3. What maintenance is required?
Inspect guide rods and stack alignment monthly; wipe rods and replace worn bushings annually.
4. Is installation available?
Yes—schedule professional installation during checkout for a seamless setup.
5. What warranty covers these machines?
New units carry full OEM coverage; remanufactured units include a 12 month Build A Gym Guarantee.
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.
$1,495.00
This machine
Bundle total
- Items
- $3,747.28
- Bundle price
- $3,559.92
- Estimated bundle saving
- −$187.36
- Ships complete in
- 4–6 weeks
One freight booking, one delivery window, one crew. Inside Delivery & Assembly available on the whole bundle.