Which of the following is a common symptom during an asthma attack?

Labored breathing is a common symptom during an asthma attack due to the narrowing of the airways, which can be triggered by various factors such as allergens, exercise, or stress. During an attack, the muscles surrounding the airways tighten, leading to inflammation and increased mucus production, making it difficult for the individual to breathe comfortably. As a result, the person may experience difficulty exhaling, wheezing, and a significant increase in effort required to breathe, all of which are manifestations of labored breathing.

The other choices do not reflect symptoms typically associated with an asthma attack. Rapid heart rate can occur during an attack but is not a primary defining symptom. Improvements in exercise tolerance or enhanced exercise performance are not characteristics of an asthma attack, as asthma typically impairs physical activity due to respiratory distress, not enhances it.