Ergatta's personalized Intensity Zones represent your effort relative to your output. They reflect your speed as well as your endurance at four levels of intensity: Paddle, Steady, Race, and Sprint.
Intensity Zones are initially personalized to you based on the results of your calibration row. As you continue to use your Ergatta, these Intensity Zones are automatically recalibrated based on your workouts. Each Intensity Zone is defined as a range of split times (speed), and corresponds to an approximate level of effort.