Spirit Fitness CSI-LELC i-Strength Dual Leg Extension/Leg Curl

Yes — the CSI-LELC replaces the stack and pulleys with an Electronically Adaptive Resistance System controlled from a 10.1" touchscreen, giving finer resistance control across 18-201 lb and four distinct training modes a stack-and-pin machine can't match.

The CSI-LELC belongs to Spirit Fitness's i-Strength line, which swaps the mechanical weight stack and pulley system used on machines like the CSD-LELC for an Electronically Adaptive Resistance System controlled entirely through a 10.1" touchscreen console. Resistance runs from 18 to 201 lb in fine electronic increments rather than fixed 5 lb plate jumps, and four programmed modes — Pure, Eccentric, Isokinetic, and Elastic — change how the resistance behaves through the rep, not just how much of it there is. The machine still trains the same opposing muscle groups from one seated station, with an axis of rotation engineered for a natural feel switching between leg extension and leg curl. Because there's no stack, pulleys, or cables to maintain, the moving parts that wear fastest on a mechanical dual are largely eliminated. Spirit backs the CSI-LELC with its Commercial warranty tier, including a 10-year frame term, so the added technology doesn't come with reduced coverage.

It ships free via LTL freight across three cartons with liftgate delivery included by default, and Spirit Fitness recommends at least two people for assembly.

The CSI-LELC ships free by LTL freight, arriving disassembled across three cartons per Spirit Fitness's packing spec, with liftgate delivery included by default so the crates come off the truck without a dock or forklift. If you have a loading dock or forklift on-site, ask for a no-liftgate freight quote to save on the delivery cost. Each shipment includes a full illustrated owner's manual along with every tool and piece of hardware needed for setup, and Spirit Fitness recommends at least two people handle assembly of the frame and console. Professional installation is also available through Blue Sky Fitness Supply if you'd rather not assemble it yourself.

Contact Blue Sky Fitness Supply first — we handle the warranty claim and coordinate with Spirit Fitness's service network to source the replacement part, so you're not navigating it alone.

If the touchscreen console, the resistance module, or any other part ever needs service, Blue Sky Fitness Supply handles the claim on your behalf and coordinates directly with Spirit Fitness's authorized service network to source the replacement. All repairs must be preauthorized before any work begins. Spirit Fitness's own service department is also reachable directly if you'd rather coordinate yourself, but it's never required — Blue Sky manages the process either way. Because the resistance system is electronic rather than mechanical, the console and resistance module carry their own dedicated 2-year parts and 1-year labor coverage under the warranty, on top of the standard component terms.

A 10-year term covers the frame, welds & cams; 5 years covers bushings, bearings, shocks & pulleys; 2 years covers the console & resistance module; and 1 year covers finishes, cables, grips & labor.

Spirit Fitness backs the CSI-LELC with a Commercial warranty covering every functional component. The frame, welds, and cams carry a 10-year term, while bushings, bearings, shocks, and pulleys are covered for 5 years. Because the resistance system is electronic rather than mechanical, the touchscreen console and resistance module get their own 2-year parts term plus 1-year labor. Paint and finishes, cables, grips, pull-pin components, rail wheels, attachments, and all other parts carry a 1-year term, upholstery is covered for 6 months, and general labor runs 1 year. Registration must be completed online within 10 days of delivery to validate coverage, and prisons or correctional facilities are excluded.

It's rated for users up to 350 lb, and a padded, adjustable seat plus a natural axis of rotation let a wide range of body sizes line up correctly for both leg extension and leg curl.

The CSI-LELC is rated for a 350 lb max user weight, which covers the vast majority of a commercial membership base. Because both leg extension and leg curl are trained from the same seated station, correct alignment matters: the padded, adjustable seat sets hip and knee position, while the engineered axis of rotation keeps the knee tracking naturally through both movements. The touchscreen console also lets each user select a training mode — Pure, Eccentric, Isokinetic, or Elastic — matched to their goals or ability level, rather than being locked into one fixed feel. That combination of physical adjustment and electronic customization makes the CSI-LELC workable for a broader range of users than a fixed-ratio, pin-select machine.

An Electronically Adaptive Resistance System inside the resistance module generates resistance from 18 to 201 lb, set and adjusted on the 10.1" touchscreen console instead of a pop-pin and plates.

Instead of a stack of steel plates and a pulley, the CSI-LELC generates resistance electronically inside a fully enclosed resistance module, adjustable from 18 to 201 lb directly from the 10.1" touchscreen console. Four programmed modes change how that resistance behaves through the rep: Pure applies constant resistance, Eccentric emphasizes the lowering phase, Isokinetic holds a constant speed regardless of effort, and Elastic ramps resistance like a band. Because adjustments happen electronically rather than by moving a pin, resistance can change in increments far finer than a 5 lb plate jump, and the setting is exact and repeatable every time a user returns to the machine. The console also receives over-the-air software updates, so new programs or refinements can reach the machine without an on-site service visit.

Leg extension trains the quadriceps on the front of the thigh; leg curl trains the hamstrings on the back. Training both from one station builds balanced strength across opposing muscle groups.

The CSI-LELC trains the two major opposing muscle groups of the upper leg from a single seated station. Leg extension isolates the quadriceps, the muscles on the front of the thigh responsible for straightening the knee, while leg curl works the hamstrings on the back of the thigh that flex it. Training both is important for balanced lower-body strength and healthy knee mechanics, which is why the pairing is a staple across general fitness, athletic training, and rehab or pre-hab programming. Because the CSI-LELC's electronic resistance lets each movement run its own program, quads and hamstrings can each get a training mode suited to how they load, without leaving the seat between exercises.

It occupies about 65.5" L × 55.5" W and stands 44.5" tall, and its low-profile design trains two opposing muscle groups from a single seated station.

The CSI-LELC occupies about 65.5 inches long by 55.5 inches wide and stands 44.5 inches tall, with a low-profile frame designed to keep sightlines open across the room. Because it trains both leg extension and leg curl from one seated station, it does the job of two separate machines in the footprint of one — a real consideration when every square foot of a gym floor has to earn its place. Steel feet with rubber covers keep the 348.3 lb frame stable and floor-safe once it's assembled. For a facility deciding what to fit into a fixed footprint, that two-in-one, low-profile design is often the deciding factor over a bulkier dual machine.

Commercial Warranty:
‎ ‎ ‎ ‎ ‎ ‎ ●‎‎ ‎ ‎ Frame: 10 years
‎ ‎ ‎ ‎ ‎ ‎ ●‎‎ ‎ ‎ Bushings / Bearings / Pulleys: 5 years
‎ ‎ ‎ ‎ ‎ ‎ ●‎‎ ‎ ‎ Console / Resistance Module: 2 years
‎ ‎ ‎ ‎ ‎ ‎ ●‎‎ ‎ ‎ Other parts: 1 year
‎ ‎ ‎ ‎ ‎ ‎ ●‎‎ ‎ ‎ Upholstery: 6 months
‎ ‎ ‎ ‎ ‎ ‎ ●‎‎ ‎ ‎ Labor: 1 year https://www.blueskyfitsupply.com/pages/warranty-information

Blue Sky Fitness Supply will process your order within 24 hours of receiving it.

Your order will be packaged and shipped within 2 weeks of being processed. The transit time upon shipment is typically 5-10 days.

Once the shipment goes out and tracking information becomes available, it will be sent to you so you can track the shipment from door to door.

Our full shipping policy can be found here under Spirit Fitness: https://www.blueskyfitsupply.com/pages/shipping-policy

Blue Sky Fitness Supply requests that customers who wish to return purchased goods for any reason after receiving a delivery contact us within 30 days of placing the order to request a return. Return requests made outside of 30 days may not be approved.

Our full return and refund policy can be found here under Spirit Fitness: https://www.blueskyfitsupply.com/pages/return-and-refund-policy

Spirit Fitness has been a leader in the fitness industry since 1983, building a reputation for delivering top-notch commercial and residential fitness equipment. From their first treadmill to today’s high-tech machines, Spirit Fitness has sold over 1.2 million pieces of equipment and now offers a range of 140 diverse products across 12 categories. With over 55 prestigious awards recognizing their innovation and product design, Spirit Fitness is a true powerhouse in the world of health and wellness.

For four decades, Spirit Fitness has focused on combining quality with real-world usability. Their equipment is built to last, produced in ISO-certified factories that ensure every piece meets the strictest standards for durability and performance. It’s no surprise that their equipment is now used in over 50 countries worldwide. Spirit Fitness continuously integrates the latest technology into their designs, from cooling fans and touchscreen displays to Bluetooth connectivity and app integration, keeping users engaged and motivated to meet their fitness goals.

One of the reasons Spirit Fitness products stand out is their global reach. Through a network of trusted distributors and dealers, they’ve made their equipment accessible to a wide variety of customers, from fitness centers to fire departments, municipalities, corporate wellness programs, and even medical rehabilitation facilities. Blue Sky Fitness Supply is proud to be a trusted partner, ensuring that customers have access to Spirit Fitness’ best-in-class products and outstanding support.

Spirit Fitness is as committed to customer experience as they are to innovation. Their U.S.-based customer service team is ready to assist with any questions, and they back every purchase with a 30-day, no-questions-asked money-back guarantee. Spirit Fitness understands that investing in fitness equipment is about long-term goals, and they strive to provide an unparalleled experience with every product.

Whether outfitting a fitness center or upgrading home equipment, Spirit Fitness offers exceptional reliability, intuitive operation, and premium features designed for ultimate comfort and convenience. Trusted by over 50 global markets and recognized for their quality and performance, Spirit Fitness has become the go-to brand for those who want the very best in fitness equipment.

It's this idea of providing excellent fitness solutions with world leading customer service which makes the partnership between Blue Sky Fitness Supply and Spirit Fitness such a no-brainer. Both companies have a shared commitment to providing the best customer experience at the best price.

As an authorized dealer, Blue Sky Fitness Supply ensures that customers have access to Spirit Fitness’ industry-leading products, backed by expert advice and seamless support throughout the purchasing and installation process. This collaboration allows Blue Sky Fitness Supply to deliver the same high standards of excellence that Spirit Fitness is known for, offering a trusted source for fitness enthusiasts and professionals alike to find the best equipment for their needs.