3 . Race walking shares many fitness benefits with running, research shows, while most likely contributing to fewer injuries. It does, however, have its own problem.

Race walkers are conditioned athletes. The longest track and field event at the Summer Olympics is the 50-kilometre race walk, which is about five miles longer than the marathon. But the sport’s rules require that a race walker’s knees stay straight through most of the leg swing and one foot remain in contact with the ground at all times. It’s this strange form that makes race walking such an attractive activity, however, says Jaclyn Norberg, an assistant professor of exercise science at Salem State University.

Like running, race walking is physically demanding, she says. According to most calculations, race walkers moving at a pace of six miles per hour would burn about 800 calories (卡路里) per hour, which is approximately twice as many as they would burn walking, although fewer than running, which would probably burn about 1,000 or more calories per hour.

However, race walking does not pound the body as much as running does, Dr Norberg says. According to her research, runners hit the ground with as much as four times their body weight per step, while race walkers, who do not leave the ground, create only about 1.4 times their body weight with each step.

As a result, she says, some of the injuries associated with running, such as runner’s knee, are uncommon among race walkers. But the sport’s strange form does place considerable stress on the ankles and hips, so people with a history of such injuries might want to be cautious in adopting the sport. In fact, anyone wishing to try race walking should probably first consult a coach or experienced racer to learn proper technique, she says. It takes some practice.

4 . For people suffering from depression, there’s an all-natural treatment they should use — getting more exercise. It could help fight depression, even if people have a genetic risk, new research shows.

For the study, researchers collected information from nearly 8,000 people and found those with related genes were more likely to have depression over the next two years after examining them. But that was less likely for people who were more active at the study’s start, even if they had a family history of depression. Higher levels of physical activity helped protect even those with the highest genetic risk of depression.

Both high-intensity (高强度) exercise and low-intensity activities were associated with a reduced risk of depression. Adding four hours of exercise a week could lower the risk of a new episode (一段经历) of depression by 17%, according to the study. “Our findings strongly suggest that, when it comes to depression, being physically active has the potential to remove the added risk of future episodes in individuals who are genetically risky,” said lead author Karmel Choi. “On average, about 35 additional minutes of physical activity each day may help people to reduce their risk and protect against future depression episodes.”

Depression is a common mental illness globally, with more than 264 million people affected. “Depression is so ubiquitous, and that underlines the need for effective approaches that can impact as many people as possible,” Choi said. And mental health and primary care providers can use the findings to advise patients that there’s something meaningful they can do to lower their risk of depression.

5 . Running is often tiring and a lot of hard work, but nothing beats the feeling you get after finishing a long workout around the track.

But while it’s long been believed that endorphins (内啡肽) —chemicals in the body that cause happiness—are behind the so-called “runner’s high”, a study suggested that there may be more to this phenomenon than we previously knew.

According to a recent study published by a group of scientists from several German universities, a group of chemicals called endocannabinoids (内源性大麻素) may actually be responsible for this familiar great feeling.

To test this theory, the scientists turned to mice. Both mice and humans release high levels of endorphins and endocannabinoids after exercise. After exercising on running wheels, the mice seemed happy and relaxed and displayed no signs of anxiety. But after being given a drug to block their endorphins, the mice’s behavior didn’t seem to change. However, when their endocannabinoids were blocked with a different drug, their runners’ high symptoms seemed to fade.

“The long-held notion of endorphins being responsible for the runner’s high is false. Endorphins are effective pain relievers, but only when it comes to the pain in your body and muscles you feel after working out,” Patrick Lucas Austin wrote on science blog Lifchacker.

Similar studies are yet to be carried out on humans, but it’s already known that exercise is a highly effective way to get rid of stress or anxiety. The UK’s National Health Service even prescribes (开药 方) exercise to patients who are suffering from depression. “Being depressed can leave you feeling low in energy, which might put you off being more active. Regular exercise can improve your mood if you have depression, and its especially useful for people with mild to moderate (中等的) depression,” it wrote on its website.

It seems like nothing can beat that feeling we get after a good workout, even if we don’t fully understand where it comes from. At least if we’re feeling down, we know that all we have to do is to put on our running shoes.

6 . The Price of a Dream

I grew up poor. We had little money, but plenty of love and attention. I understood that no matter how poor a person was, they could still afford a dream. My dream was athletics.

By the time I was sixteen, I was good at baseball and football. My high school coach was Ollie Jarvis. He not only believed in me, but taught me the difference between having a dream and showing conviction (信念).

One summer a friend recommended me for a summer job. This meant a chance for money in my pocket — cash for dates with girls, certainly, money for a new bike and new clothes, and the start of savings for a house for my mother.

Then I realized I would have to give up summer baseball to handle the work schedule, and that meant I would have to tell Coach Jarvis I wouldn’t be playing. I was afraid of this, but my mother said, “If you make your bed, you have to lie in it.” 

When I told Coach Jarvis, he was as mad as I expected him to be. “Your playing days are limited. You can’t afford to waste them,” he said.

I stood before him with my head hanging, trying to think of the words that would explain to him why I dream of buying my mom a house.

“How much are you going to make at this job, son?” he demanded.

“Three point twenty-five an hour,” I replied.

“Well,” he asked, “is $3. 25 an hour the price of a dream?”

That question exposed the difference between wanting something right now and having a goal. I devoted myself to sports that summer, and within the year I was drafted by the Pittsburgh Pirates to play rookie-league ball, and offered a $20, 000 contract. I signed with the Denver Broncos in 1984 for $1.7 million, and bought my mother my dream house.

Sports Day was getting close in the school. All the children were very excited and were practicing for the big race. John, one of the fast runners of the school, was confident that he would win for he was not doing anything at all. “You have to work hard to come first in the race John. You are not practicing at all,” said John’s mother.

“Mom, you know how fast I am! Why should I waste my time running? Only I will win; no one else will win!”said John. “John, you may be right but talent (天赋) without hard work is not good at all. This laziness of yours will cost you greatly,” his mother warned him. John just laughed. He was so confident that he would win the trophy (奖杯) as no one else in his class was as fast as he was!.

Tim, a classmate of John, was also participating (参加) in the running race. He was not a fast runner. However, he practiced till late at night and had developed great endurance (持久力) to run the race.

There were a few days left for the Sports Day but John did not practice at all. On the other hand, Tim practiced day and night.

The Sports Day was almost around the corner but John was confident that no one could beat him and had not practiced at all. But Tim with his hard work had become a very great runner.

At last, the Sports Day arrived. All the students showed up on the ground to cheer their favorites. The coach blew the whistle (口哨) and everyone began to run toward the finishing line. It was so exciting. John and Tim left all the racers far behind. Both of them were neck to neck.

Suddenly, John went ahead of Tim.

John’s mother came up to Tim and praised him for his hard work.

8 . Physical education, or gym class, isn’t required for all high school students. In some schools, it isn’t offered for some different reasons. But should high school students have physical education? The answer is certainly “yes”.

Today many people don’t do sports. But as is known to all, doing sports is very important for an adult. Teaching teens the importance of a healthy lifestyle and making fitness plans now can help teens put exercise in the first place as an adult.

High school isn’t that easy. Many students are under a lot of stress. Stress can be harmful to a student’s studies and life. Doing sports can help them deal with stress better, helping them live a happier life at school.

The American Heart Association says that 10 million kids and teens suffer from obesity (肥胖症). Teens should get 60 minutes of physical activity per day to control their weight and to help their bones get stronger.

The increase in activities that don’t get teens to move around, such as video games and computer activities, means many teens don’t get their required exercise. Physical education classes act as a public health measure to encourage activity and help teens have healthy weights.

Inactivity increases teens’ risk of developing many diseases. An active lifestyle offers a good way of protection from these health problems. As much as 75 percent of health-care spending goes toward treating medical conditions that can be hindered by lifestyle changes, according to the American College of Sports Medicine.

According to the President’s Council on Fitness, Sports and Nutrition (PCFSN), students who performed five hours of physical activity each week improved their academic (学业的) performance. Students from programs with no physical activity, who used the extra time for classroom study, did not perform better on tests than those who gave up some study time in support of physical education.