The specific aerobic exercise is the most important factor if a person's goal is to increase his or her overall fitness. Aerobic exercises means "with oxygen" which will increase your heart rate while working out. Some of the specific aerobic exercises include brisk walking, swimming, running, also known as cardio workouts.
1.5 it’s ethical In my opinion
Answer:
Fear (from a quick Google search): "An unpleasant feeling triggered by the perception of danger, real or imagined."
Simply put, fear keeps us safe (or at least tries to). It helps keep us on the lookout for things that could be of harm to us.