The target wattage allows the user to set the intensity of the movement (in Watts), and then the user must reach the set strength regardless of the tread frequency (RPM) during exercise. To understand the mystery is actually very simple, you can learn from the following formula: Output power Watts = exercise intensity (that is, resistance Resistant) X tread frequency (RPM every few times) When the treading frequency is fast, the system to give the resistance ; The other hand, when the user step on the slow, the system will automatically increase the resistance.