Spirit Fitness SP-4305 Leg Extension

Product Overview

The Spirit Fitness SP-4305 Leg Extension is a commercial-grade strength machine engineered to isolate and develop the quadriceps with precision and control. Designed around proper knee alignment and smooth biomechanics, it delivers a safe and effective leg extension movement while minimizing joint stress. With ergonomic adjustments, a compact footprint, and durable construction, the SP-4305 is an essential lower-body training solution for professional fitness environments.

PIN: SP-4305

Key Features

• Targeted Quadriceps Isolation
  Optimized movement pattern maximizes quad activation while maintaining joint safety.
• Adjustable Back Pad Alignment
  Ensures proper positioning with the machine’s axis of rotation for correct biomechanics.
• Self-Adjusting Tibia Pad
  Automatically adapts to leg length, reducing setup time and improving comfort.
• Adjustable Range of Motion
  Accommodates users with different flexibility levels, including limited knee flexion.
• Smooth Cable-Driven Resistance
  Provides consistent, fluid motion throughout the full extension range.
• Integrated Rep Counter & Storage
  Tracks performance while offering convenient top-cap storage.
• Compact Commercial Design
  Space-efficient footprint ideal for high-traffic gym environments.

Specifications

Performance

• Exercise Type: Leg extension (quadriceps 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: Quadriceps

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
• Leg 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): 1475 × 1260 × 1500 mm (58" × 50" × 59")
• Machine Weight: 241 kg / 531 lb
• Weight Stack: 115 kg / 250 lb
• Maximum User Weight: Approx. 163 – 180 kg (360 lb range)
• User Height Range: Approx. 4’11” – 6’8”