it effectively turned sedentary 55-year-olds into 30-year-olds when viewed through heart activity monitoring equipment.
Being that heart disease is the leading cause of death for most people in the United States, and cardiac strength is inversely correlated with heart disease, it’s probably one of the most significant studies on exercise ever carried out.
As someone who’s been fat and unfit, thin and fit, and thin but not especially fit, I’m seconding that fitness is the key. Exercise feels better thin than fat, but it’s not nearly as fun when you’re out of shape as when you’re fit.
I don’t have the body type to be fat and fit, though, so no idea about that combo