{"product_id":"nautilus-nitro-plus-lower-back-remanufactured","title":"Nautilus Nitro Plus Lower Back (Remanufactured)","description":"\u003cstyle\u003e\n  .bs-wrap *{box-sizing:border-box;margin:0;padding:0}\n  .bs-wrap{font-family:'Barlow',sans-serif;color:#1a1a1a;max-width:700px}\n  .bs-badge{display:inline-block;background:#1a1a1a;color:#f0ebe3;font-size:11px;font-weight:500;letter-spacing:.12em;text-transform:uppercase;padding:4px 10px;border-radius:3px;margin-bottom:16px}\n  .bs-desc{font-size:15px;line-height:1.8;color:#444;margin-bottom:24px}\n  .bs-desc strong{color:#1a1a1a;font-weight:500}\n  .bs-divider{border:none;border-top:1px solid #e5e5e5;margin:24px 0}\n  .bs-section-label{font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:#999;font-weight:500;margin-bottom:12px}\n  .bs-muscles{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:8px}\n  .bs-muscle-tag{font-size:12px;font-weight:500;padding:5px 13px;border-radius:20px;background:#fff7ed;color:#92400e;border:1px solid #fcd9a0}\n  .bs-muscle-tag.sec{background:#f5f5f5;color:#666;border-color:#e0e0e0}\n  .bs-specs-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:24px}\n  .bs-spec-card{background:#f7f7f5;border-radius:8px;padding:14px 16px}\n  .bs-spec-label{font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:#999;margin-bottom:4px}\n  .bs-spec-val{font-family:'Barlow Condensed',sans-serif;font-size:20px;font-weight:600;color:#1a1a1a}\n  .bs-spec-sub{font-size:12px;color:#888;margin-top:3px}\n  .bs-feat{display:flex;align-items:flex-start;gap:12px;padding:12px 0;border-top:1px solid #efefef}\n  .bs-feat:last-child{border-bottom:1px solid #efefef}\n  .bs-feat-icon{width:30px;height:30px;border-radius:50%;background:#fff0f0;display:flex;align-items:center;justify-content:center;flex-shrink:0;margin-top:1px}\n  .bs-feat-icon svg{width:14px;height:14px;stroke:#dc2626;fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}\n  .bs-feat-name{font-size:14px;font-weight:500;color:#1a1a1a;margin-bottom:3px}\n  .bs-feat-desc{font-size:13px;color:#666;line-height:1.6}\n  .bs-span2{grid-column:span 2}\n\u003c\/style\u003e\n\u003cdiv class=\"bs-wrap\"\u003e\n\u003cp class=\"bs-desc\"\u003eThe Nautilus Nitro Plus Lower Back machine delivers \u003cstrong\u003eseated 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\u003c\/strong\u003e. 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.\u003c\/p\u003e\n\u003cp class=\"bs-desc\"\u003eSmooth resistance system for joint-friendly lumbar loading. Commercial-grade build quality and upholstery for sustained high-rotation use. \u003cstrong\u003e572 lb Nautilus Nitro Plus commercial frame\u003c\/strong\u003e, 56\"×38\" footprint. Contact us for stack specifications. Remanufactured.\u003c\/p\u003e\n\u003chr class=\"bs-divider\"\u003e\n\u003cp class=\"bs-section-label\"\u003ePrimary muscles targeted\u003c\/p\u003e\n\u003cdiv class=\"bs-muscles\" style=\"margin-bottom: 10px;\"\u003e\n\u003cspan class=\"bs-muscle-tag\"\u003eErector Spinae\u003c\/span\u003e \u003cspan class=\"bs-muscle-tag\"\u003eMultifidus\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cp class=\"bs-section-label\"\u003eSecondary muscles\u003c\/p\u003e\n\u003cdiv class=\"bs-muscles\" style=\"margin-bottom: 0;\"\u003e\n\u003cspan class=\"bs-muscle-tag sec\"\u003eGluteus Maximus\u003c\/span\u003e \u003cspan class=\"bs-muscle-tag sec\"\u003eQuadratus Lumborum\u003c\/span\u003e\n\u003c\/div\u003e\n\u003chr class=\"bs-divider\"\u003e\n\u003cp class=\"bs-section-label\"\u003eKey features\u003c\/p\u003e\n\u003cdiv class=\"bs-feat\"\u003e\n\u003cdiv class=\"bs-feat-icon\"\u003e\u003csvg viewbox=\"0 0 24 24\"\u003e\u003cline x1=\"4\" y1=\"20\" x2=\"20\" y2=\"20\"\u003e\u003c\/line\u003e\u003cline x1=\"4\" y1=\"20\" x2=\"4\" y2=\"6\"\u003e\u003c\/line\u003e\u003cline x1=\"4\" y1=\"20\" x2=\"18\" y2=\"6\"\u003e\u003c\/line\u003e\u003cpath d=\"M4 13 a9 9 0 0 1 7 -7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"bs-feat-name\"\u003eAngled Back Pad · Adj. Range Limiter — Isolated Lumbar Loading, Controlled Arc\u003c\/div\u003e\n\u003cdiv class=\"bs-feat-desc\"\u003eAngled 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.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bs-feat\"\u003e\n\u003cdiv class=\"bs-feat-icon\"\u003e\u003csvg viewbox=\"0 0 24 24\"\u003e\u003ccircle cx=\"12\" cy=\"12\" r=\"10\"\u003e\u003c\/circle\u003e\u003ccircle cx=\"12\" cy=\"12\" r=\"3\"\u003e\u003c\/circle\u003e\u003cline x1=\"12\" y1=\"2\" x2=\"12\" y2=\"9\"\u003e\u003c\/line\u003e\u003cline x1=\"12\" y1=\"15\" x2=\"12\" y2=\"22\"\u003e\u003c\/line\u003e\u003c\/svg\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"bs-feat-name\"\u003eGas-Assisted Seat · Smooth Resistance · 572 lb Nitro Plus Frame\u003c\/div\u003e\n\u003cdiv class=\"bs-feat-desc\"\u003eGas-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.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003chr class=\"bs-divider\"\u003e\n\u003cp class=\"bs-section-label\"\u003eSpecifications\u003c\/p\u003e\n\u003cdiv class=\"bs-specs-grid\"\u003e\n\u003cdiv class=\"bs-spec-card\"\u003e\n\u003cdiv class=\"bs-spec-label\"\u003eDimensions (L × W × H)\u003c\/div\u003e\n\u003cdiv class=\"bs-spec-val\"\u003e56\" × 38\" × 54\"\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bs-spec-card\"\u003e\n\u003cdiv class=\"bs-spec-label\"\u003eMachine Weight\u003c\/div\u003e\n\u003cdiv class=\"bs-spec-val\"\u003e572 lb\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bs-spec-card\"\u003e\n\u003cdiv class=\"bs-spec-label\"\u003eWeight Stack\u003c\/div\u003e\n\u003cdiv class=\"bs-spec-val\"\u003eContact Us\u003c\/div\u003e\n\u003cdiv class=\"bs-spec-sub\"\u003eAngled back pad · Adj. range limiter · Gas-assisted seat · Smooth resistance\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bs-spec-card\"\u003e\n\u003cdiv class=\"bs-spec-label\"\u003eCondition\u003c\/div\u003e\n\u003cdiv class=\"bs-spec-val\"\u003eRemanufactured\u003c\/div\u003e\n\u003cdiv class=\"bs-spec-sub\"\u003eNautilus Nitro Plus · \u003ca href=\"https:\/\/ctxhomegyms.com\/pages\/what-is-refurbished\" style=\"color: #888; text-decoration: underline;\"\u003eView condition details\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bs-spec-card bs-span2\"\u003e\n\u003cdiv class=\"bs-spec-label\"\u003eDesign\u003c\/div\u003e\n\u003cdiv class=\"bs-spec-val\"\u003eLumbar Ext. · Range Limiter · Gas Seat · 572 lb\u003c\/div\u003e\n\u003cdiv class=\"bs-spec-sub\"\u003eSeated lumbar extension · Angled back pad · Lumbar support · Adjustable range limiter · Gas-assisted seat · Smooth resistance · Commercial upholstery · 572 lb · 56\"×38\" footprint\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- ============================================================\nSEO FIELDS — paste into Shopify's Search Engine Listing section\n============================================================\n\nPage title (max 60 chars):\nNautilus Nitro Plus Lower Back Machine | Remfg\n\nMeta description (max 160 chars):\nRemanufactured Nautilus Nitro Plus Lower Back. Lumbar extension, adjustable range limiter, gas-assisted seat, 572 lb commercial lower back machine, 56×38\" footprint.\n\nTags (comma separated):\nNautilus Nitro Plus lower back, Nautilus lower back machine remanufactured, lumbar extension machine, erector spinae machine, adjustable range limiter back machine, gas assisted seat back extension, selectorized lower back, 572lb lower back machine, commercial lumbar machine, remanufactured lower back extension\n\n============================================================ --\u003e","brand":"Nautilus Nitro Plus","offers":[{"title":"Default Title","offer_id":47632961601776,"sku":"NPP-LB","price":1495.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0510\/0981\/4682\/files\/142-01-reman-transparent-white-2048_4877e661-b563-4f7f-a500-f28415634f3a.png?v=1787181836","url":"https:\/\/www.buildagym.com\/es\/products\/nautilus-nitro-plus-lower-back-remanufactured","provider":"Build A Gym","version":"1.0","type":"link"}