Please Health Question

Heart arrhythmias are the most common cause of palpitations. However, there are a number of heath conditions, medications, and other substances that can make the heart beat abnormall

The person who utilize the progression principle will keep adding the difficulty of the exercise that he's doing, while the person who does not, will only stay stagnant.  the person that utilize progression principle, will get a stronger endurance because now his body is conditioned to do harsher routines.{the answer was already on verified)