{"product_id":"nautilus-nitro-plus-leg-extension-remanufactured","title":"Nautilus Nitro Plus Leg Extension (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 Leg Extension delivers \u003cstrong\u003efull 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\u003c\/strong\u003e. 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°–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.\u003c\/p\u003e\n\u003cp class=\"bs-desc\"\u003eErgo Grip® handles for stability throughout the extension arc. Traditional seat pads for familiar comfort. Partially shielded stack for clean aesthetics and accessible weight selection. \u003cstrong\u003e557 lb Nautilus Nitro commercial frame\u003c\/strong\u003e, 55\"×36\" footprint. 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\"\u003eRectus Femoris\u003c\/span\u003e \u003cspan class=\"bs-muscle-tag\"\u003eVastus Lateralis\u003c\/span\u003e \u003cspan class=\"bs-muscle-tag\"\u003eVastus Medialis\u003c\/span\u003e \u003cspan class=\"bs-muscle-tag\"\u003eVastus Intermedius\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\u003cspan class=\"bs-muscle-tag sec\"\u003eTibialis Anterior\u003c\/span\u003e\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\u003cpath d=\"M4 20 Q8 4 12 12 Q16 20 20 4\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"bs-feat-name\"\u003eVariable Resistance Cams · Axis Alignment — Load Matched to Quad Strength Curve\u003c\/div\u003e\n\u003cdiv class=\"bs-feat-desc\"\u003eClassic variable resistance cams vary the mechanical advantage of the lever through the extension arc — increasing resistance at the quads' strongest range (60°–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.\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\u003cline x1=\"4\" y1=\"6\" x2=\"14\" y2=\"6\"\u003e\u003c\/line\u003e\u003ccircle cx=\"18\" cy=\"6\" r=\"2\"\u003e\u003c\/circle\u003e\u003cline x1=\"4\" y1=\"12\" x2=\"20\" y2=\"12\"\u003e\u003c\/line\u003e\u003cline x1=\"4\" y1=\"18\" x2=\"14\" y2=\"18\"\u003e\u003c\/line\u003e\u003ccircle cx=\"18\" cy=\"18\" r=\"2\"\u003e\u003c\/circle\u003e\u003c\/svg\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"bs-feat-name\"\u003eQuick-Set Pad · 245 lb Stack · 5 lb Increments · Ergo Grip® Handles\u003c\/div\u003e\n\u003cdiv class=\"bs-feat-desc\"\u003eQuick-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.\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\"\u003e55\" × 36\" × 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\"\u003e557 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\"\u003e245 lb\u003c\/div\u003e\n\u003cdiv class=\"bs-spec-sub\"\u003e5 lb increments · Variable resistance cams · Quick-set pad · Ergo Grip®\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 · \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\"\u003eVar. Cam · 245 lb · 5 lb Inc. · Quick-Set · 557 lb\u003c\/div\u003e\n\u003cdiv class=\"bs-spec-sub\"\u003eVariable 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\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 Leg Extension | Remanufactured\n\nMeta description (max 160 chars):\nRemanufactured Nautilus Nitro Leg Extension. Variable resistance cams, 245 lb stack, 5 lb increments, 557 lb commercial quad isolation machine, 55×36\" footprint.\n\nTags (comma separated):\nNautilus Nitro leg extension, Nautilus leg extension remanufactured, variable resistance cam leg extension, 245lb stack leg extension, 5lb increment leg extension, quick set leg pad, Ergo Grip leg extension, commercial leg extension Nautilus, selectorized quad machine, remanufactured Nautilus leg extension\n\n============================================================ --\u003e","brand":"Nautilus Nitro Plus","offers":[{"title":"Silver Frame \u0026 Blue Upholstery","offer_id":48815723151600,"sku":"NAUT-NP-LE-1","price":2495.0,"currency_code":"USD","in_stock":true},{"title":"Silver Frame \u0026 Black Upholstery","offer_id":48815723184368,"sku":"NAUT-NP-LE-2","price":2295.0,"currency_code":"USD","in_stock":true},{"title":"Black Frame \u0026 Black Upholstery","offer_id":48933353455856,"sku":"NAUT-NP-LE-3","price":2295.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0510\/0981\/4682\/files\/141-01-reman-transparent-white-2048_08d7189c-198a-45cb-9075-e69a328ae91e.png?v=1787181620","url":"https:\/\/www.buildagym.com\/products\/nautilus-nitro-plus-leg-extension-remanufactured","provider":"Build A Gym","version":"1.0","type":"link"}