1. The correct answer is A. work at a lower speed for more days a week. If you are new at whatever activiy it is important to be patient and step by step gain confidence on what you are doing.
2. The correct answer is B. Long lasting. Chronic means that something last long and in some diseases there is treatment for that condition but it never disappears.
3. The correct answer is D. He should start walking two miles a day, three days a week. After two weeks, he will jog one mile and walk one mile three days a week. Carsiovascular fitness is based on walking and running but for running you have to walk first. It is important to train periodically.