{"product_id":"built-strength-infinite-series-back-extension-new","title":"BUILT Strength Infinite Series Back Extension (New)","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 BUILT Strength Infinite Series Back Extension is a commercial-grade selectorized machine built to \u003cstrong\u003eload the posterior chain directly and repeatedly\u003c\/strong\u003e — spinal erectors, glutes, and hamstrings working through a controlled extension arc with smooth, consistent resistance from a 200 lb weight stack. Pin-select adjustments keep load changes fast between sets, supporting everything from warm-up volume to heavy working sets.\u003c\/p\u003e\n\u003cp class=\"bs-desc\"\u003eAdjustable hip pads and handlebars let every user dial in the correct starting position — \u003cstrong\u003eproper hip height and grip placement locked in before the first rep\u003c\/strong\u003e, keeping spinal alignment safe and the movement pattern repeatable across an entire session.\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\"\u003eGlutes\u003c\/span\u003e \u003cspan class=\"bs-muscle-tag\"\u003eHamstrings\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\"\u003eAdductors\u003c\/span\u003e \u003cspan class=\"bs-muscle-tag sec\"\u003eCore\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=\"6\" x2=\"20\" y2=\"6\"\u003e\u003c\/line\u003e\u003cline x1=\"4\" y1=\"12\" x2=\"20\" y2=\"12\"\u003e\u003c\/line\u003e\u003cline x1=\"4\" y1=\"18\" x2=\"20\" y2=\"18\"\u003e\u003c\/line\u003e\u003ccircle cx=\"8\" cy=\"6\" r=\"2\"\u003e\u003c\/circle\u003e\u003ccircle cx=\"16\" cy=\"12\" r=\"2\"\u003e\u003c\/circle\u003e\u003ccircle cx=\"10\" cy=\"18\" r=\"2\"\u003e\u003c\/circle\u003e\u003c\/svg\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"bs-feat-name\"\u003e200 lb Selectorized Weight Stack\u003c\/div\u003e\n\u003cdiv class=\"bs-feat-desc\"\u003ePin-select resistance up to 200 lb — a heavier ceiling than the standard model, supporting advanced athletes running high-load posterior chain programming.\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=\"20\" y2=\"6\"\u003e\u003c\/line\u003e\u003cline x1=\"4\" y1=\"12\" x2=\"14\" y2=\"12\"\u003e\u003c\/line\u003e\u003ccircle cx=\"18\" cy=\"12\" r=\"2\"\u003e\u003c\/circle\u003e\u003cline x1=\"4\" y1=\"18\" x2=\"20\" y2=\"18\"\u003e\u003c\/line\u003e\u003ccircle cx=\"10\" cy=\"6\" r=\"2\"\u003e\u003c\/circle\u003e\u003ccircle cx=\"8\" cy=\"18\" r=\"2\"\u003e\u003c\/circle\u003e\u003c\/svg\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"bs-feat-name\"\u003eAdjustable Hip Pads \u0026amp; Handlebars\u003c\/div\u003e\n\u003cdiv class=\"bs-feat-desc\"\u003eBoth the hip pad height and handlebar position adjust independently — locking every user into correct spinal alignment regardless of torso length or build.\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\u003cpath d=\"M12 12c-2-2.5-4-4-6-4a4 4 0 0 0 0 8c2 0 4-1.5 6-4z\"\u003e\u003c\/path\u003e\u003cpath d=\"M12 12c2 2.5 4 4 6 4a4 4 0 0 0 0-8c-2 0-4 1.5-6 4z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"bs-feat-name\"\u003eSmooth, Controlled Motion\u003c\/div\u003e\n\u003cdiv class=\"bs-feat-desc\"\u003eThe resistance path follows a natural extension arc with consistent tension throughout — clean mechanical loading on the posterior chain from bottom stretch to full extension.\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\u003crect x=\"2\" y=\"10\" width=\"4\" height=\"4\" rx=\"1\"\u003e\u003c\/rect\u003e\u003crect x=\"18\" y=\"10\" width=\"4\" height=\"4\" rx=\"1\"\u003e\u003c\/rect\u003e\u003cline x1=\"6\" y1=\"12\" x2=\"18\" y2=\"12\"\u003e\u003c\/line\u003e\u003crect x=\"5\" y=\"9\" width=\"3\" height=\"6\" rx=\"0.5\"\u003e\u003c\/rect\u003e\u003crect x=\"16\" y=\"9\" width=\"3\" height=\"6\" rx=\"0.5\"\u003e\u003c\/rect\u003e\u003c\/svg\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"bs-feat-name\"\u003eBarbell Resistance Option\u003c\/div\u003e\n\u003cdiv class=\"bs-feat-desc\"\u003eUsers can hold a barbell across the upper back to add resistance beyond the weight stack — extending the loading range for advanced athletes who have outpaced selectorized limits.\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\u003crect x=\"3\" y=\"3\" width=\"18\" height=\"18\" rx=\"2\"\u003e\u003c\/rect\u003e\u003cline x1=\"3\" y1=\"9\" x2=\"21\" y2=\"9\"\u003e\u003c\/line\u003e\u003cline x1=\"9\" y1=\"21\" x2=\"9\" y2=\"9\"\u003e\u003c\/line\u003e\u003c\/svg\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"bs-feat-name\"\u003eHeavy-Duty Commercial Frame\u003c\/div\u003e\n\u003cdiv class=\"bs-feat-desc\"\u003eBuilt for high-frequency commercial use — handles daily high-load training in professional facilities and serious home gym setups without compromise.\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\"\u003e48\" × 39\" × 62\"\u003c\/div\u003e\n\u003cdiv class=\"bs-spec-sub\"\u003e1219 × 991 × 1575 mm\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\"\u003e597 lb\u003c\/div\u003e\n\u003cdiv class=\"bs-spec-sub\"\u003e271 kg\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\"\u003e200 lb\u003c\/div\u003e\n\u003cdiv class=\"bs-spec-sub\"\u003e91 kg · Pin-select selectorized\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\"\u003eNew\u003c\/div\u003e\n\u003cdiv class=\"bs-spec-sub\"\u003eCommercial performance standard\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bs-spec-card bs-span2\"\u003e\n\u003cdiv class=\"bs-spec-label\"\u003eAdjustability\u003c\/div\u003e\n\u003cdiv class=\"bs-spec-val\"\u003eHip Pads \u0026amp; Handlebars\u003c\/div\u003e\n\u003cdiv class=\"bs-spec-sub\"\u003eIndependent adjustment for correct alignment across all body sizes\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- ============================================================\nSEO FIELDS — paste these into Shopify's Search Engine Listing section\n============================================================\n\nPage title (max 60 chars):\nBUILT Strength Back Extension | 200lb Selectorized\n\nMeta description (max 155 chars):\n200 lb selectorized back extension machine, new condition. Adjustable hip pads, barbell option, and heavy-duty frame for posterior chain training.\n\nTags (comma separated):\nback extension machine, selectorized back extension, posterior chain machine, glute machine, erector spinae, hamstring machine, commercial gym equipment, BUILT Strength, Infinite Series, hyperextension machine, 200lb weight stack\n\n============================================================ --\u003e","brand":"BUILT Strength","offers":[{"title":"Default Title","offer_id":49489078321392,"sku":"BB021","price":3295.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0510\/0981\/4682\/files\/BUILTStrength_52.png?v=1774998498","url":"https:\/\/ctxhomegyms.com\/es\/products\/built-strength-infinite-series-back-extension-new","provider":"CTX Home Gyms","version":"1.0","type":"link"}