Spirit Fitness SP-4306 Seated Leg Curl

Product Overview

The Spirit Fitness SP-4306 Seated Leg Curl is a commercial-grade strength machine engineered to isolate and strengthen the hamstrings with precision and safety. Designed around a seated movement pattern, it ensures proper knee alignment and controlled muscle engagement while reducing strain on the joints. With ergonomic adjustments, smooth resistance, and a compact footprint, the SP-4306 delivers efficient lower-body training for users of all levels in professional fitness environments.

PIN: SP-4306

Key Features

• Targeted Hamstring Isolation
  Provides a controlled seated curl movement that effectively engages the hamstrings while minimizing knee stress.
• Adjustable Thigh Pad Alignment
  Positions the knee joint accurately with the machine’s axis of rotation for optimal biomechanics.
• Self-Adjusting Tibia Pad
  Automatically adapts to leg position, reducing setup time and enhancing user comfort.
• Adjustable Range of Motion
  Allows users to customize start and end points, ideal for different flexibility levels and rehabilitation needs.
• Smooth Cable-Driven Resistance
  Ensures fluid, consistent motion throughout each repetition for safe and effective training.
• Integrated Rep Counter & Storage
  Tracks performance while providing convenient storage on the top cap.
• Commercial-Grade Construction
  Built with a heavy-duty steel frame and premium upholstery for long-term durability.

Specifications

Performance

• Exercise Type: Seated leg curl (hamstring isolation)
• Resistance System: Selectorized weight stack
• Weight Stack: 115 kg / 250 lb
• Increment: 5 lb (2.2 kg) increments
• Pulley Ratio: Approx. 0.75
• Movement: Cable-driven system for smooth, controlled resistance
• Target Muscles: Hamstrings, with secondary activation of calves and glutes 

Design & Build

• Frame: Heavy-duty commercial-grade steel
• Finish: Electrostatic powder-coated, corrosion-resistant surface
• Seat & Pads: Adjustable back pad with high-density foam cushioning
• Thigh Pad: Adjustable for precise knee alignment
• Lower Pad: Self-adjusting tibia pad for ease of use
• Mechanics: Adjustable range of motion for user-specific flexibility
• Convenience Features: Rep counter, storage tray, enclosed weight stack 

Dimensions & Capacity

• Dimensions (L × W × H): 1455 × 1265 × 1500 mm (57" × 50" × 59")
• Machine Weight: 240 kg / 530 lb
• Weight Stack: 115 kg / 250 lb
• Maximum User Weight: Approx. 180 kg / 360 lb
• User Height Range: Approx. 4’11” – 6’8”