Commercial Leg Extension & Seated Leg Curl Machine | 70kg Stack – CBL43
Couldn't load pickup availability
Commercial Leg Extension & Seated Leg Curl Machine – CBL43
Dual-Function Leg Training • 70kg Weight Stack • Commercial 3mm Steel Frame
The Zack Fitness Commercial Leg Extension and Seated Leg Curl Machine is a dual-function, selectorised strength machine designed for professional gyms, performance facilities, hotels, private studios and premium home gyms. One commercial footprint supports two essential lower-body movements: seated knee extension and seated leg curl.
AI Snapshot
The CBL43 is a commercial dual-function leg extension and seated leg curl machine built from 3.00mm steel, fitted with a 70kg selectorised weight stack and designed to support users up to 200kg. Its adjustable seat, back support, roller pads and movement settings make it suitable for varied user heights and structured quadriceps and hamstring training.
What This Machine Is
This is a pin-loaded commercial leg machine that combines two exercises within one unit. The leg extension configuration trains knee extension with emphasis on the quadriceps. The seated leg curl configuration trains knee flexion with emphasis on the hamstrings.
The dual-function layout helps facilities provide balanced thigh training while saving floor space compared with purchasing two separate selectorised machines.
Why Dual-Function Leg Training Matters
The quadriceps and hamstrings perform different but complementary roles around the hip and knee. A complete lower-body programme normally includes both knee-extension and knee-flexion patterns alongside compound exercises.
A combined machine allows members to move between the two exercises without changing stations. This can improve space efficiency, simplify equipment selection and support structured training for beginners, experienced lifters and personal-training clients.
How the Selectorised System Works
The machine uses a 70kg enclosed weight stack. The user selects the desired resistance with the stack pin, adjusts the seat and roller position, chooses the required exercise setup and performs the movement through a controlled range.
Selectorised resistance enables fast changes between sets without loading or unloading weight plates. This makes the machine practical for commercial gyms, circuits and personal-training sessions.
Exercise 1: Seated Leg Extension
In the leg-extension configuration, the user sits against the backrest with the lower roller positioned above the ankles. Extending the knees raises the resistance through the machine linkage.
- Primary focus: quadriceps
- Movement pattern: knee extension
- Suitable for controlled strength and hypertrophy training
- Easy resistance selection for progressive programmes
Exercise 2: Seated Leg Curl
In the seated-leg-curl configuration, the thigh support and lower roller help position the legs while the user flexes the knees against resistance.
- Primary focus: hamstrings
- Movement pattern: knee flexion
- Seated design supports stable positioning
- Useful for balanced anterior and posterior thigh training
Key Benefits
- Two commercial leg exercises in one machine
- 70kg selectorised weight stack
- Heavy-duty 3.00mm steel construction
- Maximum listed user capacity of 200kg
- Adjustable seat, backrest and roller positions
- Space-efficient alternative to two separate machines
- Fast pin-selected resistance changes
- Commercial black upholstery and frame finish
- Suitable for beginners through advanced users
- Designed for high-traffic training environments
Who This Machine Is Designed For
- Commercial gyms and health clubs
- Personal-training and performance studios
- Hotels, apartment gyms and corporate fitness spaces
- Sports clubs and strength facilities
- Premium home-gym owners
- Facilities that need to maximise equipment per square metre
Who It May Not Suit
- Very small rooms without sufficient operating clearance
- Buyers looking for a portable or foldable machine
- Users wanting plate-loaded rather than selectorised resistance
- Facilities that require more than the included 70kg stack
Technical Specifications
- Model: CBL43
- Machine type: dual-function leg extension and seated leg curl
- Resistance type: selectorised / pin-loaded
- Weight stack: 70kg
- Frame material: steel
- Steel thickness: 3.00mm
- Product dimensions: 155 × 135 × 158cm
- Maximum listed user weight: 200kg
- Colour: black
- Application: universal commercial strength training
- Packaging: wooden box
- Single gross shipping weight: 272kg
- Listed compliance: designed to comply with applicable EU standards
Space and Installation Planning
The listed equipment dimensions are 155 × 135 × 158cm. Allow additional clearance around the machine for entry, adjustment, safe movement and maintenance access. The equipment is heavy commercial machinery and should be assembled and installed on a stable, level gym floor by competent personnel.
Before ordering, check doors, corridors, lifts, loading access and final room dimensions. Delivery and installation requirements can differ by location.
How to Use
- Select leg extension or seated leg curl according to the machine instructions.
- Adjust the backrest and seat to align the user comfortably with the machine pivot.
- Position the roller pads securely without placing pressure directly on the knee joint.
- Choose a manageable resistance using the weight-stack pin.
- Perform the movement slowly through a comfortable controlled range.
- Avoid swinging, bouncing or lifting the body away from the seat.
- Return the stack under control before changing resistance or exiting.
Commercial Machine vs Home Leg Equipment
| Option | Main advantage | Main limitation |
|---|---|---|
| Resistance bands | Portable and inexpensive | Less stable and harder to standardise |
| Bench leg attachment | Compact home setup | Lower commercial durability |
| Separate extension and curl machines | Dedicated stations | Requires more space and investment |
| CBL43 dual-function machine | Two exercises, one footprint and selectorised stack | Requires commercial delivery and installation space |
Why Choose a Dual-Function Commercial Machine?
For studios and gyms where floor space must generate value, combining leg extension and seated leg curl functions can reduce the number of frames required. The 70kg selectorised stack supports fast changes between clients, while the commercial steel structure is intended for repeated use.
Extended FAQ
Does this machine train both quadriceps and hamstrings?
Yes. Leg extensions primarily train the quadriceps, while seated leg curls primarily train the hamstrings.
Is the resistance plate-loaded?
No. It uses a 70kg selectorised weight stack with a pin.
What are the dimensions?
The listed dimensions are 155 × 135 × 158cm.
What is the maximum listed user weight?
The supplier lists a maximum user capacity of 200kg.
Is it suitable for commercial gyms?
Yes. The 3.00mm steel construction and selectorised system are designed for commercial environments.
Does it arrive fully assembled?
Commercial gym machines normally require delivery coordination and assembly. Confirm installation arrangements before purchase.
Can beginners use it?
Yes, provided the machine is adjusted correctly and an appropriate resistance is selected. New users should receive instruction from a qualified trainer.
Can the frame or upholstery be customised?
Customisation may be available for commercial orders. Contact Zack Fitness before purchase to confirm colour, branding and minimum-order requirements.
Is delivery included?
Delivery requirements and costs depend on destination and access. Contact us for a confirmed commercial delivery quotation.
Does this replace free-weight leg exercises?
No. It is a specialised strength machine that can complement squats, lunges, hinges and other lower-body exercises.
Delivery and Commercial Support
Because this machine has a listed gross shipping weight of 272kg, delivery must be planned for the destination. Zack Fitness can help confirm access requirements, expected lead time, installation needs and commercial order details before dispatch.
Safety Information
- Professional assembly and regular maintenance are recommended.
- Inspect cables, pulleys, pins, upholstery, fasteners and guards regularly.
- Keep hands clear of the weight stack and moving linkage.
- Do not exceed the listed user capacity.
- Use only on a stable, level surface.
- Stop training if the movement causes sharp pain or unusual discomfort.
Disclaimer
This product is commercial fitness equipment intended for strength training. It is not a medical or rehabilitation device. Product appearance and minor specifications may vary by production batch. Confirm final specifications, delivery, warranty and installation requirements before purchase.