Researchers have found that short, intense exercise sessions prove to be healthier than longer, more moderate sessions with an equal caloric burn.

　　The study found that activities like running and jumping reduced participants' risk of developing metabolic syndrome (代谢综合征) by two-thirds, compared with moderate activities like walking and leisurely bike rides that burned an equal number of calories.

　　Metabolic syndrome is a set of health conditions that significantly increase your risk of heart disease and type 2 diabetes (糖尿病). Insulin (胰岛素) resistance and extra weight around the middle--that dreaded "belly fat"--are two major health conditions associated with the syndrome.

　　The researchers used data collected from l, 841 American adults. It is suggested that vigorous physical activity should be emphasized in public health guidelines for exercise.

　　Currently, the non-profit organization Society for Exercise Physiology recommends 150 minutes of moderate to vigorous physical activity per week for adults aged 18-64.

　　Avoiding metabolic syndrome isn't the only reason to change your exercise routine. One study found that gym goers who totaled 150 minutes of vigorous activity a week looked about l0 years younger than those who skip the gym altogether, while another study found that physical activity can cut the risk of breast cancer by up to 30 percent in older women at a healthy body weight.

　　Also in recent years, studies have determined that three minutes of intense exercise, three times a week, could be the equivalent to five one-hour sessions, reducing the risk of heart disease and diabetes.

　　Comment 1:

　　Exercising is very personal. Nobody can say which one suits you except yourself. I have been walking for 45-50 minute everyday for the past l0 years, and it's fine with me now. I think walking is the best way to keep me healthy.

　　Comment 2:

　　Exercise is just like anything. Don't overdo it but also don't just use it as an excuse to say you are working out. It needs to be in a good range to give you a good sweat but don't destroy yourself as well. The bottom line is to get out and exercise. It might not make you live longer but it definitely will make you healthier.

　　Comment 3:

　　Any exercise is good, short or long, fast or slow, especially the exercise in fresh air.

　　Comment 4:

　　I've always done 15-20mins but I don't take breaks. I move from one machine to the next after my first round, I grab some water and then do a second round and then I'm finished. 20mins solid, only one water break.

　　练习题：

　　1、The main idea of the passage is that______.

　　A. short and intense exercise can avoid metabolic syndrome

　　B. intense exercise can reduce the risk of heart disease and diabetes

　　C. shorter and more vigorous exercise can do better to health

　　D. metabolic syndrome can increase health disorders

　　2. According to the passage, metabolic syndrome ______.

　　A. is resulted from insulin resistance and the dreaded" belly fat"

　　B. can increase the risk of heart disease and diabetes

　　C. can be cured by short and vigorous exercise

　　D. is a kind of deadly disease

　　3. According to the passage, vigorous exercises can also______.

　　A. make people look younger

　　B. help people lose weight

　　C. help people save time

　　D. be more interesting

　　4. The writer of Comment 2 believes that_______.

　　A. the advice of the passage is not suitable for him

　　B. too much exercise can destroy people's health

　　C. different people should do exercise differently

　　D. people should exercise in an appropriate time and intensity

　　5. Which writer of the following comments does the same as advised in the passage?

　　A. The writer of Comment 1.

　　B. The writer of Comment 2.

　　C. The writer of Comment 3.

　　D. The writer of Comment 4.

　　参考答案：

　　1、C　2、B　3、A　4、D　5、D