Final answer:
A trainer should help the client stop exercising, ensure they take their fast-acting medication via an inhaler, and seek immediate medical attention if there are signs of a severe asthma attack.
Step-by-step explanation:
If a client experiences an asthma attack while exercising, the first and most important action a trainer should take is to help the individual stop exercising and ensure they are in a position that eases breathing, such as sitting upright.
Next, the trainer should assist the client in taking their short-term, fast-acting asthma medication, which is typically administered via an inhaler.
If symptoms such as coughing, shortness of breath, wheezing, and chest tightness do not improve promptly, or if the client shows signs of a severe asthma attack like cyanotic lips, confusion, drowsiness, rapid pulse, sweating, or severe anxiety, the trainer must seek immediate medical attention for the client. It is crucial for trainers to be aware of the symptoms and seriousness of an asthma attack and to have an emergency action plan in place.