Which fat group is healthiest? Why?

Which fat group is least healthy?
Why?

Monounsaturated and polyunsaturated fats (sometimes called 'good fats) tend to lower your blood LDL cholesterol when they replace saturated fats in the diet. Polyunsaturated fats have a slightly greater ability to reduce LDL cholesterol than monounsaturated fats.

the more fit you are, the faster the recovery. your heart rate drops most sharply in the first minute after you stop exercising; it should then fall about 20 beats a minute—a drop of less than 12 beats a minute is considered abnormal. this “recovery heart rate” is measured as part of an exercise stress test.