Question: what is the difference between peak and cardio on fitbit?
Answer: 50-70% of your MHR: This is what the American Heart Association considers to be moderate exercise, and can also be referred to as "fat burn" zone. Working out in this zone will, as the name suggests, burn fat and also build endurance. 70-85% of your MHR: Vigorous exercise, also known as aerobic or cardio zone.