For sale: Gazelle Air Walker from the well-known World Fitness brand for exercising and toning the entire body. Device Features: Condition: Used in excellent condition and ready for immediate use. Design: Durable black and red frame, weight-bearing and easy to use at home. Benefit: Reduces pressure on knees and joints, excellent for fitness, burning calories, and body toning. Size: Lightweight and does not take up much space.