{"product_id":"the-quadrilogy-selectorized-leg-extension-seated-leg-curl-machine-copy","title":"THE IRON PRONE™ Selectorized Leg Extension + Prone Leg Curl Machine","description":"\u003ch6\u003e\u003cspan\u003eTHE IRON PRONE™ Leg Extension + Prone Leg Curl\u003c\/span\u003e\u003c\/h6\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eTHE IRON PRONE™\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e is the fourth generation of our popular Leg Extension + Prone Leg Curl machine. It builds upon the feel, functionality, and adjustability of previous versions while incorporating higher felt resistance*, significant structural upgrades, premium materials, and numerous improvements developed from customer feedback.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe Iron Prone is also one of the first selectorized Temple of Gainz machines available with our patent-pending \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eBeyond Power VOLTRA Digital Resistance Integration\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. This optional configuration allows a compatible Beyond Power VOLTRA to replace the traditional weight stack, reducing the initial cost of the machine while providing greater control over resistance, eccentric loading, and resistance-curve customization^.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eWeight Stack Configuration:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e In stock and ships within \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e5 to 15 business days, \u003c\/span\u003ewith free curbside freight delivery.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eVOLTRA-Only Configuration:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Machines equipped with the integrated VOLTRA mount and VOLTRA cable-routing components, without a weight stack or guide rods, are estimated to begin shipping in \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003emid-September 2026\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eAll shipping dates are estimates and are subject to production, freight, quality-control, and other delays. Please review our payment and cancellation policies, which apply to all purchased and unfulfilled orders.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch6\u003e\u003cspan\u003eWhat Is The Iron Prone?\u003c\/span\u003e\u003c\/h6\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe Iron Prone combines two highly effective lower-body isolation exercises, the leg extension and prone leg curl, into one heavy-duty machine with a compact footprint.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe machine transitions quickly between both movements using aluminum pop pins. With the seat pad lowered and the back pad raised, the machine is configured for leg extensions. With the seat pad raised and the back pad lowered, it converts into a prone leg curl machine.\u003cbr\u003e\u003cbr\u003eWhile the prone leg curl back pad is fixed, the machine uses an extended seat pad to accommodate a wide range of users. Shorter users can also place an additional pad between their back and the back pad to fine-tune positioning and maintain a comfortable setup.\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe movement arm offers ten starting positions, while the leg roller includes five adjustment positions. Together, these adjustments allow users to customize their starting position, range of motion, stretch, and alignment for both exercises.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eLaser-engraved adjustment numbers on the movement arm and leg roller make it easy to record and consistently repeat preferred settings.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe recessed front crossmember provides additional clearance and greater range of motion at the bottom of the leg extension. The updated movement-arm geometry also provides greater range of motion and a deeper available stretch across both exercises.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch6\u003e\u003cspan\u003eWhat’s New for The Iron Prone?\u003c\/span\u003e\u003c\/h6\u003e\n\u003ch6\u003e\u003cspan\u003eStructural Enhancements and Increased Rigidity\u003c\/span\u003e\u003c\/h6\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe Iron Prone features extensive structural improvements designed to increase stability, rigidity, and long-term durability.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eTwo additional crossmembers have been added to the lower and rear portions of the frame for increased structural reinforcement.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eMajor frame connections have been upgraded to hex bolts secured with reinforcement plates.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe movement-arm mounting points have been heavily reinforced with welded triangular brackets, additional through-bolts, and reinforcement plates.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe leg-roller assembly has been redesigned with additional triangular supports and reinforced bearing brackets on both sides of the movement arm.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe leg extension and prone leg curl handles now use rounded mounting brackets designed to reduce play and movement while improving overall stability.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch6\u003e\u003cspan\u003eLarger Cam and Higher Felt Resistance*\u003c\/span\u003e\u003c\/h6\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe Iron Prone frame and movement mechanics have been redesigned to accommodate a significantly larger cam. The updated cam geometry increases the felt resistance during both the leg-extension and prone leg-curl movements compared with previous versions.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe revised cam and pulley mechanics are designed to provide a smoother, more deliberate resistance profile throughout each movement, including increased resistance through portions of the range where previous versions may have felt lighter.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe included \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e120 kg \/ 264 lb weight stack\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, combined with the machine’s updated cam geometry, provides substantial loading capacity for progressive overload across a wide range of users and training levels.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch6\u003e\u003cspan\u003ePremium Material Upgrades\u003c\/span\u003e\u003c\/h6\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eSolid Guide Rods:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e The Weight Stack Configuration now includes upgraded solid-metal guide rods. These provide greater rigidity and allow the machine to be transported fully assembled when appropriate equipment, securing methods, and handling procedures are used.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eAluminum Pulleys Standard:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Aluminum pulleys now come standard on all Iron Prone configurations.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eKnurled Aluminum Handles:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Knurled aluminum handles replace the previous rubber-grip handles and come standard on both the leg-extension and prone leg-curl handle assemblies.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch6\u003e\u003cspan\u003eUpdated Branding\u003c\/span\u003e\u003c\/h6\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe Iron Prone introduces a new metallic Temple of Gainz shield logo, a redesigned and streamlined exercise instruction label, and new Temple of Gainz purple-themed weight-stack decals.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe exercise instruction label is optional. The purple portions of the weight-stack decals may also be trimmed away by the customer to create a black-and-white appearance, if preferred. Any decal modification is performed at the customer’s discretion.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch6\u003e\u003cspan\u003eConfiguration Options\u003c\/span\u003e\u003c\/h6\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eWeight Stack Configuration\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e includes a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e120 kg \/ 264 lb selectorized weight stack\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, solid-metal guide rods, the standard weight-stack cable, aluminum pulleys, and knurled aluminum handles.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eVOLTRA-Only Configuration\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e includes the integrated VOLTRA mounting system, VOLTRA-compatible cable routing, a direct 1:1 attachment option, and the attachment point required for an optional 1:2 pulley configuration.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe VOLTRA-Only Configuration \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003edoes not include\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e a Beyond Power VOLTRA, DIY Dock, weight stack, guide rods, climbing pulley, or the standard weight-stack cable.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eFor 1:2 operation, a compatible climbing pulley is required and must be purchased separately.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch6\u003e\u003cspan\u003eCompact Footprint\u003c\/span\u003e\u003c\/h6\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eDespite its versatility, adjustability, and reinforced construction, The Iron Prone delivers substantial functionality within a manageable footprint suitable for home gyms, personal-training studios, and light commercial facilities.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003ePlease review the dimensions shown in the product gallery, including the machine’s minimum and maximum dimensions across its available adjustment positions.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003e*Felt Resistance Disclaimer\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003ePublished pulley ratios, weight-stack values, and resistance descriptions are provided for general reference and do not guarantee the exact force experienced by every user.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eActual felt resistance may vary based on cam geometry, cable routing, pulley configuration, machine settings, seat and pad positions, user height and limb length, exercise technique, range of motion, movement speed, cable tension, friction, maintenance condition, manufacturing tolerances, and any digital resistance settings used.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe nominal 1:1 pulley ratio describes the cable-routing relationship and should not be interpreted as a guarantee that the force experienced at the leg roller will exactly match the selected weight throughout the entire movement.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eResistance changes through the range of motion based on the cam profile, movement-arm position, and user setup. Comparisons with other machines, free weights, cable systems, digital resistance devices, or prior Temple of Gainz models are inherently approximate.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003e^Beyond Power VOLTRA Compatibility and Safety Disclaimer\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe Beyond Power VOLTRA and DIY Dock are manufactured and sold separately and are not included.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eUsers must follow all operating instructions, warnings, resistance limits, setup requirements, and safety guidance provided by both Temple of Gainz and Beyond Power.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eFor additional information regarding VOLTRA use and digital resistance integration, please review our \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eDigital Resistance Integration Disclaimer\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e before purchasing or using the machine.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eBy purchasing the VOLTRA-Only Configuration or using a VOLTRA with The Iron Prone, the purchaser acknowledges that they have reviewed and accepted the Digital Resistance Integration Disclaimer and understand the applicable operating instructions, resistance limitations, safety guidelines, inherent risks, and user responsibilities.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eFuture Weight Stack Conversion\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eCustomers who purchase the VOLTRA-Only Configuration may later purchase the components required to convert the machine to the traditional Weight Stack Configuration, subject to availability and compatibility.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe current estimated price for the conversion package is \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e$649\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, plus applicable taxes and freight shipping. Freight shipping may cost approximately \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e$400 or more\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, depending on destination, carrier rates, delivery requirements, and accessorial charges.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003ePricing and availability are subject to change. Installation is not included.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eDelivery and Assembly Expectations\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003ePlease review our \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eShipping Policy\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e and \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eProduct and Assembly Disclaimer\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e before purchasing, including all delivery, inspection, installation, and assembly expectations.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBy completing a purchase, the customer acknowledges and agrees to the applicable shipping, assembly, payment, cancellation, safety, and product-use policies.\u003c\/span\u003e\u003c\/p\u003e","brand":"Temple of Gainz","offers":[{"title":"Selectorized Weight Stack (120 kgs \/ 264 lb)","offer_id":52697249972536,"sku":"TOG-1058-B","price":2649.99,"currency_code":"USD","in_stock":true},{"title":"VOLTRA I Integration (VOLTRA I Device Not Included)","offer_id":52697250005304,"sku":"TOG-1058-B-V","price":2149.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0845\/4019\/5128\/files\/TOG-1058THEIRONPRONELEGEXTENSION8.png?v=1787513896","url":"https:\/\/templeofgainz.com\/products\/the-quadrilogy-selectorized-leg-extension-seated-leg-curl-machine-copy","provider":"Temple of Gainz","version":"1.0","type":"link"}