Whats the real bottom line when it comes to the impact of different cardio activities on heart health - are we just getting caught up in the more is better mentality, or is there genuinely a hierarchy of benefits when comparing something like cycling, running, and swimming in terms of cardiovascular improvement? Can we truly say that one activity is unequivocally better for your heart than the others, or is it all about individual variability and the actual intensity and duration of your workouts? And whats the actual science behind why some cardiologists swear by high-intensity interval training (HIIT) as the key to optimal cardiovascular health, while others claim that steady-state cardio is still the way to go for overall heart health benefits? It seems like theres a lot of conflicting info out there, so Id love to hear from people with actual expertise in the field - what are the cold, hard facts when it comes to the impact of different cardio activities on heart health, and is there really a best way to do it?