I also find comparing serious endurance athletes pushing their physical limits to regular cardio for general fitness training to be an inappropriate comparison. (burnthefatblog.com)
(And even then, there are many ways to develop a high level of general fitness apart from CF). (scienceofrunning.com)
This powers the built - in coaching, which can guide you through workouts based on your current heart rate and general fitness level. (digitaltrends.com)