{"product_id":"precor-c-line-leg-extension-remanufactured","title":"Precor C Line 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 Precor C-Line Leg Extension delivers \u003cstrong\u003eselectorized quad isolation with an adjustable start position, precision pivot point, ergonomic seat and rollers, integrated weight stack, and commercial-grade C-Line construction — 575 lb commercial frame, 53\"×49\" footprint\u003c\/strong\u003e. The leg extension is the primary machine for isolated quadriceps training — it trains the knee extension movement in isolation from the hip, which means the glutes and hamstrings that assist with squatting and pressing movements do not contribute. This makes the leg extension the machine that produces the most concentrated quad stimulus available on a selectorized floor. The adjustable start position is the specification that distinguishes a well-engineered leg extension from a basic one: the start position determines where in the range of motion the knee joint begins the extension. A fixed start position forces every user to begin from the same knee angle regardless of limb length, flexibility, or injury history — users with tight hip flexors or limited knee flexion range cannot reach the standard start position without compensatory torso lean. Adjustable start position sets the roller contact to the user's comfortable starting angle, which means the productive extension range begins from where the user's anatomy allows rather than where the machine is fixed. The precision pivot point aligns the machine's rotational axis with the knee joint's anatomical axis — misalignment between the machine pivot and the knee pivot produces shear forces that load the patellar tendon rather than the quadriceps, which is the mechanism responsible for leg extension machines with a reputation for knee discomfort.\u003c\/p\u003e\n\u003cp class=\"bs-desc\"\u003eErgonomically designed seat and rollers for user comfort across all resistance settings. \u003cstrong\u003e575 lb Precor C-Line commercial frame\u003c\/strong\u003e, 53\"×49\" 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\"\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\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\"\u003eAdjustable Start Position — Extension Range Begins Where Anatomy Allows\u003c\/div\u003e\n\u003cdiv class=\"bs-feat-desc\"\u003eAdjustable start position sets roller contact to the user's comfortable starting knee angle rather than a fixed machine default. Users with limited knee flexion or tight hip flexors cannot reach a fixed start position without compensatory torso lean that shifts load off the quads. Adjustable start ensures the productive extension range begins from the user's accessible angle, covering the full population from rehabilitation through advanced training.\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\"\u003ePrecision Pivot Point · Ergonomic Rollers · 575 lb C-Line Frame\u003c\/div\u003e\n\u003cdiv class=\"bs-feat-desc\"\u003ePrecision pivot aligns the machine's rotational axis with the knee joint's anatomical axis — misalignment between machine pivot and knee pivot produces patellar tendon shear rather than quad loading, which is the root cause of leg extension machines with a reputation for knee discomfort. Ergonomic rollers distribute contact force across the shin for comfort under load. 575 lb commercial C-Line frame for long-term stability under continuous quad training.\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\"\u003e53\" × 49\" × 59\"\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\"\u003e575 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\"\u003eAdj. start position · Precision pivot · Ergonomic rollers\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\"\u003ePrecor C-Line · \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\"\u003eAdj. Start · Precision Pivot · C-Line · 575 lb\u003c\/div\u003e\n\u003cdiv class=\"bs-spec-sub\"\u003eAdjustable start position · Precision pivot point · Ergonomic seat \u0026amp; rollers · Integrated weight stack · Commercial C-Line frame · 575 lb · 53\"×49\" 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):\nPrecor C-Line Leg Extension | Remanufactured\n\nMeta description (max 160 chars):\nRemanufactured Precor C-Line Leg Extension. Adjustable start position, precision pivot, 575 lb commercial quad isolation machine, 53×49\" footprint.\n\nTags (comma separated):\nPrecor C-Line leg extension, Precor leg extension remanufactured, adjustable start leg extension, precision pivot leg extension, selectorized leg extension, commercial leg extension, quad isolation machine, C-Line leg extension, 575lb leg extension, remanufactured leg extension\n\n============================================================ --\u003e","brand":"Precor","offers":[{"title":"Default Title","offer_id":47726202355952,"sku":"PRC-C-LE-BB","price":2095.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0510\/0981\/4682\/files\/MADE_TO_ORDER_-_2025-09-19T155329.210.png?v=1758315226","url":"https:\/\/www.buildagym.com\/es\/products\/precor-c-line-leg-extension-remanufactured","provider":"Build A Gym","version":"1.0","type":"link"}