1. Introduction and Safety Information
This manual provides essential instructions for the safe and effective use of your ATLETICA Quadriga Leg Extension and Curl Machine. Please read all instructions carefully before assembly and operation. Retain this manual for future reference.
Important Safety Precautions:
- Consult a physician before starting any exercise program.
- Ensure all bolts and nuts are securely tightened before each use.
- Keep children and pets away from the machine during operation.
- Use the machine on a stable, level surface.
- Do not exceed the maximum weight capacity of 300 kg.
- Stop exercising immediately if you feel pain, dizziness, or shortness of breath.
- Wear appropriate athletic footwear and clothing.
2. Product Overview
The ATLETICA Quadriga is a versatile fitness machine designed for strengthening the quadriceps and hamstrings through leg extension and lying leg curl exercises. Its robust construction ensures stability and durability.

Figure 2.1: Side view of the ATLETICA Quadriga machine, showing its overall structure and adjustable components.
Key Features:
- Solid Steel Construction: Features a 7x7 cm profile with 2 cm thickness for maximum stability.
- Adjustable Leg Module: Adaptable to all user heights with stainless steel locking screws.
- Thick Padded Rollers: Prevents pressure pain on shins and calves.
- Multiple Backrest Angles: Two adjustable angles for leg extension and a negative incline for lying leg curls ensure optimal ergonomics.
- High Seating Position: 70 cm high for optimal freedom of movement, preventing interference with shoes.
- Weight Plate Compatibility: Chromed dumbbell plate holder compatible with 30mm or 50mm inner diameter weight plates.
- Transport Wheels: For easy relocation of the machine.

Figure 2.2: Front view, highlighting the padded leg rollers and central adjustment mechanism.
3. Setup and Assembly
The ATLETICA Quadriga machine requires assembly. Please follow the separate assembly instructions provided with your product. Ensure all components are present and undamaged before beginning assembly.
Initial Adjustments:
- Leg Module Adjustment: Locate the stainless steel locking screw on the leg module. Loosen it to slide the leg pad assembly to your desired length. Tighten the screw firmly to secure the position.

Figure 3.1: Detail of the leg module adjustment mechanism.
- Backrest Angle Adjustment: The machine offers two different backrest angles for leg extensions and a negative incline for lying leg curls. Adjust the backrest by pulling the adjustment pin and selecting the appropriate angle. Ensure the pin is fully engaged before use.

Figure 3.2: Detail of the backrest adjustment for different exercise modes.
- Weight Plate Loading: Load appropriate weight plates (30mm or 50mm inner diameter) onto the chromed weight plate holder. Secure them with collars (not included, typically).
4. Operating Instructions
4.1. Leg Extension Exercise (Quadriceps)
This exercise targets the quadriceps, responsible for knee extension.
- Setup: Adjust the machine so the rotation axis of the leg module aligns with your knee joint when seated. Position your legs behind the foot pad, at the lower shin level. Your knees should be bent at approximately 90 degrees.
- Execution: Grip the handles for stability. Extend your knees upwards, pushing the leg pad until your legs are almost parallel to the floor.
- Important: Avoid full hyperextension of the knees. Release the weight after a brief contraction, lowering your legs in a controlled manner to the starting position.
4.2. Lying Leg Curl Exercise (Hamstrings)
This exercise effectively isolates the hamstrings.
- Setup: Fold the backrest down. Lie face down on the padding, ensuring your upper body, hips, and thighs are supported. Ensure your knees do not touch the padding, are free to move, and are almost level with the machine's rotation axis. Position your legs hip-width apart with the foot pad just above your ankle, near your Achilles tendon.
- Execution: Grip the handles firmly. Begin by bending your knees to bring the pad as close to your glutes as possible.
- Important: Hold the contracted position briefly, then slowly lower your lower leg in a controlled manner to the starting position before starting the next repetition.
5. Maintenance
Regular maintenance ensures the longevity and safe operation of your ATLETICA Quadriga machine.
- Cleaning: Wipe down the machine, especially padded areas and handles, with a damp cloth after each use. Use mild soap if necessary, and dry thoroughly.
- Inspection: Periodically check all bolts, nuts, and moving parts for tightness and wear. Tighten any loose fasteners.
- Lubrication: Apply a small amount of silicone-based lubricant to moving joints and pivot points if you notice any friction or squeaking.
- Storage: Store the machine in a dry, temperate environment away from direct sunlight and extreme temperatures.
6. Troubleshooting
If you encounter any issues with your ATLETICA Quadriga machine, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Machine feels unstable or wobbly. | Loose bolts or uneven surface. | Ensure all assembly bolts are tightened. Move the machine to a level surface. |
| Movement is not smooth or makes noise. | Lack of lubrication or foreign object. | Inspect moving parts for obstructions. Apply silicone lubricant to pivot points. |
| Difficulty adjusting leg module or backrest. | Locking pin/screw not fully disengaged or mechanism is stiff. | Ensure the locking pin/screw is fully pulled/loosened. Apply lubricant if stiff. |
7. Specifications
| Feature | Detail |
|---|---|
| Brand | Atletica |
| Model Number | 555-1147 |
| ASIN | B0CSPT681X |
| Item Weight | 69 Kilograms |
| Material | 11 Gauge Alloy Steel |
| Color | Black |
| Max Load Capacity | 300 kg |
| Dimensions (Depth x Width x Height) | 144 cm (with transport wheels) x 79 cm x 116 cm (in leg extension mode) |
| Handle Type | Bar |
| Target Audience | Adult (Unisex) |
| Included Components | 1 (Main Unit) |
8. Warranty and Support
Specific warranty information for the ATLETICA Quadriga Leg Extension and Curl Machine is not provided in the available product details. For warranty claims or technical support, please contact the retailer or ATLETICA customer service directly.
Manufacturer: ATLETICA
Seller: ATLETICA BELGIUM
For further assistance, please refer to the contact information provided at the point of purchase.