Parcel ground shipping
Items weighing 149 lb or less ship by ground parcel rather than freight.
Receive by Oct 16
New
BUILT Strength Infinite Series Iso-Lateral Kneeling Leg Curl
$1,995.00
$1,596.00
Save $399.00
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Parts & Labor, Plus Lifetime Frame
New equipment. Coverage starts on the date of delivery.
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Enter your state and ZIP code to see delivery options and prices.
Machine overview
Condition: New
Warranty: 1 Year Parts & Labor (Extended Available)
Returns: 30-Day Returns & Exchanges
Shipping: Driveway Delivery, or Inside Delivery & Assembly
Receive by: Oct 16
How It Ships: Crated w/ Assembly Manual
Delivery options
How delivery works
Your item’s shipping method and price are confirmed in the shipping calculator and at checkout. Here is what each delivery path means.
Driveway freight delivery
Your equipment is palletized and protected. The freight carrier schedules delivery, then uses a liftgate to lower it to your curb or driveway. Moving it inside and unpacking it are up to you.
Inside delivery & assembly
When selected and available for your address, the delivery team brings the equipment into the room, assembles and tests it, then removes the packaging.
Full truckload
For commercial builds and multi-pallet orders, a dedicated trailer keeps the full order together in one delivery. We confirm the unloading plan before the truck ships.
Size: 71" × 56" × 58" tall
What New Means
Brand new, current-model equipment shipped in the factory crate with the full manufacturer warranty. Extended coverage is available at checkout.
Warranty Coverage
New and remanufactured equipment are both covered for one year, parts and labor, backed by us. Extended protection is available on either through BAG Care+. Used equipment is sold as-is with no warranty coverage, and is described honestly before you buy. We service nationwide - every ZIP code in the country - so coverage travels with the machine.
30-Day Returns & Exchanges
Change your mind within 30 days of delivery and you can return the machine or exchange it for a different size, color or configuration.
Return shipping is the customer's responsibility and a 15% restocking fee applies to preference returns and exchanges. Freight items must go back packaged to the same standard they arrived in — we will tell you exactly what that means before anything is collected.
Anything that arrives damaged or fails under warranty is handled separately and carries no restocking fee. Full terms are in our Returns, Exchange & Refund Policy.
Add before it ships
Before the freight bookingCoverage and accessories have to go on the same booking as the machine. Add them here and they travel together.
Extended warrantyRecommendedEvery machine includes 1 year parts and labor.
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Our own equipment line
What BUILT Strength is
Commercial-grade gear we design, stock and stand behind, sold only through Build A Gym.
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Heavy commercial steel
Frames are laser-cut and welded from heavy-gauge steel, built for daily commercial use.
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We audit the factory’s work
Our team audits the factory regularly, checking machines, welds and finishes before they ship to Texas.
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Stocked in Texas
Most of the range ships from our Jarrell, TX warehouse. Try it first at our Georgetown showroom.
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Delivered and backed for life
1 year parts and labor plus lifetime frame coverage. Add inside delivery and assembly at checkout.
Shop photo
Real photo, not a render
Uncrated in our Texas shop
A recent BUILT Strength Infinite Series Iso-Lateral Kneeling Leg Curl, uncrated and checked by our team before it went out for delivery.
- Stage
- Uncrated
- Photographed
- Sep 10, 2026
- Where
- Our shop in Texas
- Headed to
- Uncrated and checked against the parts list
- Inspected for freight damage before it moves
- Delivered from Texas, not drop-shipped
This is a recent unit of this model, not necessarily the one you'll receive. Yours goes through the same process.
About BUILT StrengthProduct details
Commercial-grade equipment, inspected and supported by warranty.
The BUILT Strength Infinite Series Iso-Lateral Kneeling Leg Curl trains each hamstring independently - one leg curls while the other rests supported on a pivoting knee cradle, eliminating the bilateral compensation that standard lying leg curls allow to go unchecked. The kneeling position lengthens the hamstring from the hip, placing it under stretch before the curl even begins and increasing the range of effective tension through each rep.
Starting resistance of just 8 lb per arm makes the movement genuinely accessible for technique work and rehabilitation, while a 4 × 25 lb max capacity supports meaningful progressive loading for strength development. Four integrated weight horns keep plates on the machine and within reach - no hunting across the floor between sets. Heavy-duty construction in a compact 40" × 54" footprint makes this machine an efficient addition to any commercial or performance training floor.
Primary muscles targeted
Biceps Femoris Semitendinosus Semimembranosus
Secondary muscles
Gastrocnemius Glutes
Key features
Iso-Lateral Unilateral Movement
Each leg curls independently - preventing the stronger hamstring from compensating for the weaker, building true bilateral balance, and allowing targeted single-leg work without changing the machine setup.
Pivoting Knee Cradle Pad
A pivoting cradle supports the non-working leg in a stable, comfortable position while the active leg moves freely through the full curl - keeping the body braced and the working hamstring isolated throughout.
Kneeling Position for Extended Range
The kneeling stance lengthens the hamstring from the hip joint before the curl begins - placing the muscle under stretch at the start of each rep and increasing the range of effective tension compared to a lying curl position.
Plate-Loaded - 8 lb to 100 lb Per Arm
Starting resistance of 8 lb per arm supports technique work and rehabilitation loads. Max capacity of 4 × 25 lb plates per arm reaches 100 lb per side for athletes building serious hamstring strength.
4 Integrated Weight Horns
On-machine plate storage keeps the surrounding floor clear and plates within reach - load and strip between sets without leaving the station or searching the gym floor mid-session.
Specifications
Dimensions (D × W × H)
40" × 54" × 49"
1016 × 1372 × 1245 mm
Machine Weight
250 lb
113 kg
Resistance Type
Plate-Loaded
8 lb starting · 4 × 25 lb max per arm
Condition
New
Infinite Series
Storage & Positioning
4 Weight Horns · Pivoting Cradle
Integrated plate storage · Pivoting knee cradle pad · Independent iso-lateral arms
1. What are the exact dimensions and footprint of this machine, and how much space should I allow for safe use?
This machine measures 40 inches front to back, 54 inches wide, and 49 inches high, with a footprint of 28 square feet. Allowing a few extra feet around the machine is suggested for comfortable access and plate loading.
2. How much weight can each arm hold, and what is the starting resistance?
Each arm starts at 8 lb resistance and can be loaded with up to 100 lb per side using four 25 lb plates. The machine is plate-loaded and does not use a weight stack.
3. Which muscles does this machine target and how does the iso-lateral design benefit training?
It primarily trains the hamstrings—biceps femoris, semitendinosus, and semimembranosus—with secondary emphasis on the glutes and gastrocnemius. The iso-lateral design ensures each leg works independently, preventing compensation and supporting balanced development.
4. What features make this machine different from standard lying leg curl machines?
The kneeling position lengthens the hamstring before the curl starts, increasing the effective range of tension. Its pivoting knee cradle supports the non-working leg, and each leg curls independently for targeted single-leg work.
5. What condition will this machine arrive in, and is assembly required?
This unit is brand new from BUILT Strength. Assembly instructions are not provided on the product page.
6. What warranty and delivery options are available for this machine?
New machines come with the manufacturer warranty, and extended coverage is available. Delivery options include curbside freight or inside delivery and assembly, with details and shipping estimates shown at checkout.
30-Day Returns & Exchanges
Buy with confidence. Every Build A Gym order includes a 30-day window to return or exchange, whether you want a different size, color or configuration. Return shipping is the customer's responsibility and a 15% restocking fee applies to preference returns; warranty and damage claims carry no restocking fee. Full details in our Returns, Exchange & Refund Policy.
The BUILT Strength Infinite Series Iso-Lateral Kneeling Leg Curl trains each hamstring independently - one leg curls while the other rests supported on a pivoting knee cradle, eliminating the bilateral compensation that standard lying leg curls allow to go unchecked. The kneeling position lengthens the hamstring from the hip, placing it under stretch before the curl even begins and increasing the range of effective tension through each rep.
Starting resistance of just 8 lb per arm makes the movement genuinely accessible for technique work and rehabilitation, while a 4 × 25 lb max capacity supports meaningful progressive loading for strength development. Four integrated weight horns keep plates on the machine and within reach - no hunting across the floor between sets. Heavy-duty construction in a compact 40" × 54" footprint makes this machine an efficient addition to any commercial or performance training floor.
Primary muscles targeted
Biceps Femoris Semitendinosus Semimembranosus
Secondary muscles
Gastrocnemius Glutes
Key features
Iso-Lateral Unilateral Movement
Each leg curls independently - preventing the stronger hamstring from compensating for the weaker, building true bilateral balance, and allowing targeted single-leg work without changing the machine setup.
Pivoting Knee Cradle Pad
A pivoting cradle supports the non-working leg in a stable, comfortable position while the active leg moves freely through the full curl - keeping the body braced and the working hamstring isolated throughout.
Kneeling Position for Extended Range
The kneeling stance lengthens the hamstring from the hip joint before the curl begins - placing the muscle under stretch at the start of each rep and increasing the range of effective tension compared to a lying curl position.
Plate-Loaded - 8 lb to 100 lb Per Arm
Starting resistance of 8 lb per arm supports technique work and rehabilitation loads. Max capacity of 4 × 25 lb plates per arm reaches 100 lb per side for athletes building serious hamstring strength.
4 Integrated Weight Horns
On-machine plate storage keeps the surrounding floor clear and plates within reach - load and strip between sets without leaving the station or searching the gym floor mid-session.
Specifications
Dimensions (D × W × H)
40" × 54" × 49"
1016 × 1372 × 1245 mm
Machine Weight
250 lb
113 kg
Resistance Type
Plate-Loaded
8 lb starting · 4 × 25 lb max per arm
Condition
New
Infinite Series
Storage & Positioning
4 Weight Horns · Pivoting Cradle
Integrated plate storage · Pivoting knee cradle pad · Independent iso-lateral arms
1. What are the exact dimensions and footprint of this machine, and how much space should I allow for safe use?
This machine measures 40 inches front to back, 54 inches wide, and 49 inches high, with a footprint of 28 square feet. Allowing a few extra feet around the machine is suggested for comfortable access and plate loading.
2. How much weight can each arm hold, and what is the starting resistance?
Each arm starts at 8 lb resistance and can be loaded with up to 100 lb per side using four 25 lb plates. The machine is plate-loaded and does not use a weight stack.
3. Which muscles does this machine target and how does the iso-lateral design benefit training?
It primarily trains the hamstrings—biceps femoris, semitendinosus, and semimembranosus—with secondary emphasis on the glutes and gastrocnemius. The iso-lateral design ensures each leg works independently, preventing compensation and supporting balanced development.
4. What features make this machine different from standard lying leg curl machines?
The kneeling position lengthens the hamstring before the curl starts, increasing the effective range of tension. Its pivoting knee cradle supports the non-working leg, and each leg curls independently for targeted single-leg work.
5. What condition will this machine arrive in, and is assembly required?
This unit is brand new from BUILT Strength. Assembly instructions are not provided on the product page.
6. What warranty and delivery options are available for this machine?
New machines come with the manufacturer warranty, and extended coverage is available. Delivery options include curbside freight or inside delivery and assembly, with details and shipping estimates shown at checkout.
30-Day Returns & Exchanges
Buy with confidence. Every Build A Gym order includes a 30-day window to return or exchange, whether you want a different size, color or configuration. Return shipping is the customer's responsibility and a 15% restocking fee applies to preference returns; warranty and damage claims carry no restocking fee. Full details in our Returns, Exchange & Refund Policy.
Save 5%
Complete the room
The machines our install crew puts in the same room as this one - priced as one shipment, delivered in one booking.
$1,995.00
This machine
Bundle total
- Items
- $2,213.28
- Bundle price
- $2,102.62
- Estimated bundle saving
- −$110.66
- Everything arrives by
- Oct 21
One freight booking, one delivery window, one crew. Inside Delivery & Assembly available on the whole bundle.