You have talked a lot about CVD but where does heart failure play into this. I’m 77, exercise daily, zone 2, resistance exercise, and HIIT once or twice a week. Very healthy, no noted CVD except incipient heart failure (ejection fraction 50%). On Jardiance for it. How does HIIT fit into this? Is it generally a good thing to do, or not indicated for someone with heart failure. Any research on this. Thanks.
If zone 2 training improves mitochondrial health, shouldn't we train different body parts under this protocol? In other words, if I use a bicycle for the zone 2 training, is this enough, or I should also do zone 2 swimming, or other zone 2 type of training for the upper body?