Final answer:
During easy workouts, you work out at the lowest end of your target heart rate zone, which can be referred to as low intensity exercise.
Step-by-step explanation:
During really easy workouts, you work out at the lowest end of your target heart rate zone. To make this sentence more precise, the words in italics should be replaced with 'low intensity'. Low intensity exercise refers to activities that require less effort and don't significantly raise your heart rate or breathing rate, making them easier to perform.
Learn more about Exercise Intensity