My recommendation would be to start at a level you can maintain and try to increase it.One way a weekend exercise can measure whether he or she is training the heart is to check how rapidly the pulse rate drops after a workout.If the rate begins to drop more quickly,that is a good sign Q.What should a person do to guard against the dangers of over-exercising? A.The single most important thing is not to exercise at an intensity greater than your heart can stand.And this can usually be determined by a stress electrocardiogram. c8州My recommendation would be to start at a level you can maintain and try to increase it.One way a weekend exercise can measure whether he or she is training the heart is to check how rapidly the pulse rate drops after a workout.If the rate begins to drop more quickly, that is a good sign. Q. What should a person do to guard against the dangers of over-exercising? A. The single most important thing is not to exercise at an intensity greater than your heart can stand.And this can usually be determined by a stress electrocardiogram