Exercise ball SPARTAN 55 cm — SPARTAN model 57, anti-burst gym stability ball

The SPARTAN exercise ball 55 cm (model 57) is a gym stability ball designed for fitness, rehabilitation and core training. With a 55 cm diameter it is intended for average-height users and supports a wide range of exercises including balance drills, Pilates, physiotherapy routines and active sitting. The ball features an anti-burst construction that reduces the risk of sudden deflation and provides a stable surface for workouts, stretching and therapeutic use.

Advantages

The anti-burst design increases safety by ensuring gradual air release under extreme load rather than sudden rupture. Made from durable, elastic material, the ball retains shape and bounce over time for consistent performance. Its 55 cm diameter is a common standard for users of average height, providing ergonomic positioning for core and stability exercises. The smooth surface and neutral design make it suitable for professional gym environments, home workouts and clinical settings.

Suitable for

• Core strengthening and balance training
• Pilates and flexibility exercises
• Rehabilitation and physiotherapy sessions
• Active sitting and posture improvement
• General fitness and mobility work

Key specifications

• Diameter: 55 cm
• Type: Gym stability / exercise ball
• Construction: Anti-burst design for gradual deflation
• Material properties: Durable, elastic, slip-resistant surface
• Intended users: Average-height adults for exercise, rehab and sitting therapy

How to use

Inflate the ball to the recommended firmness so that the 55 cm diameter specification is achieved and the surface feels firm but slightly compressible when seated. Use the ball on a flat, clean surface clear of sharp objects. For core and balance exercises, position yourself with proper alignment — feet flat on the floor, knees at approximately 90 degrees when seated, and engage abdominal muscles to maintain stability. In rehabilitation settings follow the guidance of a physiotherapist for specific movement patterns and progressions. For active sitting use a stable chair or desk setup and adjust posture regularly to avoid prolonged static positions.

Usage recommendations

Regularly inspect the ball for signs of wear or damage and keep it away from heat sources and sharp objects. Clean with a mild detergent and water; avoid harsh chemicals. Store inflated or partially deflated in a cool, dry place. Choose the 55 cm size if you are of average height or follow a professional’s sizing advice for therapeutic use.