Spirit Fitness SP-4310 Back Extension

Product Overview

The Spirit Fitness SP-4310 Back Extension is a commercial-grade strength machine engineered to strengthen the lower back and core through controlled extension movements. Designed with user stability and biomechanics in mind, it supports proper spinal alignment while allowing a full range of motion. Its ergonomic pads, adjustable positioning, and compact footprint make it an essential solution for safe, effective posterior chain training in modern fitness facilities.

PIN: SP-4310

Key Features

• Targeted Lower Back Training
  Designed to isolate the lumbar region while engaging the core for improved strength and stability.
• Adjustable Roller Pad
  Allows precise positioning across the upper back to suit different user sizes and optimize biomechanics.
• Dual Foot Bars for Stability
  Provides secure lower-body positioning, ensuring controlled movement throughout the exercise.
• Supportive Lower Back Pad
  Enhances comfort and promotes proper alignment while allowing a full extension range.
• Smooth Cable-Driven Resistance
  Ensures fluid motion and consistent resistance for safe and effective training.
• Integrated Rep Counter & Storage
  Tracks workout performance and offers convenient storage for personal items.
• Compact Commercial Design
  Space-efficient footprint ideal for high-traffic gym environments.

Specifications

Performance

• Exercise Type: Back extension (lumbar / core training)
• Resistance System: Selectorized weight stack
• Weight Stack: 123 – 128 kg (271 – 280 lb)
• Increment: 5 lb (2.2 kg) increments
• Movement: Cable-driven system for smooth, controlled resistance
• Target Muscles: Lower back, glutes, and core stabilizers 

Design & Build

• Frame: Heavy-duty commercial-grade steel
• Finish: Durable powder-coated surface
• Pads: Adjustable upper roller pad and supportive lower back pad
• Foot Support: Dual foot bars for stability and positioning
• Cushioning: High-density foam with durable upholstery
• Convenience Features: Rep counter, storage tray, enclosed weight stack 

Dimensions & Capacity

• Dimensions (L × W × H): 1223 × 1219 × 1500 mm (48" × 48" × 59")
• Machine Weight: 248 kg / 530 lb
• Weight Stack: 123 – 128 kg (271 – 280 lb)
• Maximum User Weight: Approx. 180 kg / 397 lb
• Footprint: Compact, space-efficient commercial design