Spirit Fitness SP-3503 Back Extension

Product Overview

The Spirit Fitness SP-3503 Back Extension is a commercial-grade strength machine designed to strengthen the lower back and core through a controlled extension movement. Built to support proper spinal alignment and user stability, it features an ergonomic pad system and adjustable mechanics that accommodate a wide range of users. With smooth resistance, intuitive setup, and durable construction, the SP-3503 delivers safe, effective posterior chain training in modern fitness environments.

PIN: SP-3503

Key Features

• Self-Adjusting Roller Pad
  Automatically positions across the upper back for optimal alignment and comfort during movement.
• Adjustable Range of Motion
  Allows users to customize movement limits based on flexibility, training goals, or rehabilitation needs.
• Lower Body Stabilization System
  Foot bar support keeps the body secure, ensuring controlled and effective execution.
• Ergonomic Support Design
  Promotes proper spinal positioning while enabling a full and safe extension range.
• Smooth Cable-Driven Resistance
  Provides fluid, consistent motion for controlled and efficient training.
• Integrated Storage Convenience
  Top-mounted storage tray keeps essentials like phones and water bottles within reach.
• Commercial-Grade Construction
  Heavy-duty steel frame and premium upholstery ensure long-term durability in high-use facilities.

Specifications

Performance

• Exercise Type: Back extension (lower back & core training)
• Resistance System: Selectorized weight stack
• Weight Stack: 110 kg / 240 lb
• Increment: 7.5 lb 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: Self-adjusting upper roller pad with ergonomic support
• Stabilization: Foot bar for lower body positioning
• Mechanics: Adjustable range-of-motion system
• Cushioning: High-density foam with durable upholstery
• Convenience Features: Storage tray, enclosed weight stack

Dimensions & Capacity

• Dimensions (L × W × H): 1057 × 1298 × 1592 mm (42" × 51" × 63")
• Machine Weight: 251 kg / 554 lb
• Weight Stack: 110 kg / 240 lb
• Maximum Selectable Load: 110 kg / 243 lb
• Footprint: Compact commercial design suitable for strength circuits