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语言朋友(71)most people is determining whether or not they should.This is particularly true with anyone over thirtyfive, especially if they have been heavy smokers.Likewise, young adults who have been very inactive should proceed slowly and with caution.A physical evaluation(评价)from a physician is recommended, (心血管的) problems that might not show up when the body is at rest.This is done by monitoring blood pressure, e walking.The idea is to increase heart rate and circulation slowly without placing a sudden strain on the heart or the muscles that are starting to work. The next phase in developing an exercise program is to determine the amount of exercise that is enough to condition the muscles and cardiovascular system without excessively exhausting the body.This involves taking one's pulse and finding one's target zone.This target zone, or safe璽raining pulse rate, is established by subtracting one's age frlom 220 and then taking 60 percent to 80 percent of that total.If you are just starting to exercise, 60 percent is recommended; 80 percent is recommended if you are already in good condition. 解题导语：锻炼应注意些什么？怎样进行锻炼？作者给我们作了详细的说明。er. B．A physician who is in charge of physical checkups. C．Any wouldbe sportsman. D．Anyone who wants to take up exercise. 解析：推理判断题。整篇文章是关于如何锻炼的所以读者应该是想进行锻炼的任何一个人故选D。ical activity. | 
