The simple design of this unique, non-motorized treadmill is also what makes it one of the most effective devices for high speed and interval training. Unlike standard electric treadmills, the Pro6 Arcadia Air Runner features an innovative curved deck that is completely controlled by the movements and force of the athlete using it. There are no on/off switches or complex buttons and settings to worry about. It's a manually operated treadmill that helps train and promotes technically-sound running posture, balance, and cadence.