2 . 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.

3 . There are many weird sports that are present around the world. From each region of the world, along with the very popular common sports, there are also those really popular but very weird kinds of sports.

This is indeed a very strange kind of sport that tests your stamina (耐力). You will learn how to be agile (灵活的) while competing against a horse. This game originated in the Welsh town of Llanwrtyd Wells. This sport really has to do with strength. You will require great agility and strength in order to take part in this. Marathon human contestants are put to compete against those mounted people. This is how the marathon testing takes place.

This is a sports event that was first introduced in Finland. This is all about a male competitor racing with a female in a certain way. There would be many obstructions and blocks on the way which would definitely bring you challenges. The person to win would have to finish the race without losing his female partner in the course of overcoming the obstacles even for once. This race takes place really fast and the obstacles are set that way.

This is yet another weird sport that welcomes you to use your toes. This is quite the same kind of sport that you used to play as a child which involved toe wrestling. This has now been turned into a major sport that even has a World Toe Wrestling Competition. It first originated in a pub of Derbyshire.

The locals took this sport with great enjoyment and then made this so popular that it soon had its own championship. The individuals who participate have only got to use their feet and then this is tougher than it may sound.

This is a kind of game where even the spectators (观众) get splashed with mud but in fact that is quite the fun. The very annual Summer Redneck Games in East Dublin bring about this game and bring about some of the greatest hubcap-discus throws with it. This is also a great sport to show the strength and dexterity of your feet.

In the field of sports there are some famous living legends, such as Lang Ping, and Michael Jordan.

As a player, Lang Ping brought not only honour but also glory to     1     (she) country. As     2     coach, she led the China Women’s volleyball team to medals at world championships as well as the Olympic Games. As a person, she is     3     (love) by fans at home and abroad. Before the 2015 World Cup, she     4     (face) a great challenge — two important     5     (player) had to leave because of health problems. However, Lang Ping didn’t lose heart and she led her volleyball team     6     (win) the championship.

Known as “Air Jordan”, Michael Jordan changed basketball with his graceful moves and jumps. Jordan’s skills were impressive but the mental strength     7     (make) him unique. The secret to his success is learning     8     his failures. In life, Jordan has learnt to share his     9     (succeed) with others. The Boys and Girls Club     10     he started in Chicago has been helping young people since 1996.

5 . The true Olympic spirit has been displayed by Canadian cross-country ski coach Justin Wadsworth, who helped Russian athlete Anton Gafarov with his broken ski during the Men’s Sprint Free Semifinals.

Gafarov’s start wasn’t smooth. He fell three times, crashing early in the race and breaking his ski. It was clear that Gafarov was out of the race for the men’s finals and wouldn’t be able to compete for medals. Still, he wanted to finish in front of the home crowd, but his left ski was too badly damaged in the crash and its base had come off. The Russian skier faced finishing the race by walking to the line, not skiing.

However, the Russian’s fall was seen by Canadian coach Justin Wadsworth, who immediately ran on to the course and helped Gafarov. “I went over and gave him one of Alex Harvey’s, a member of the Canadian team who didn’t qualify for the finals. It was about giving Gafarov some dignity (尊严) so he didn’t have to walk to the finish area,” Wadsworth said. “We help because we know everyone works so hard in our sport,” says Wadsworth, who was an Olympic skier for the S before becoming a coach. “Everyone wants fair results. It was a matter of allowing Gafarov to finish the race.”

Gafarov was thoughtful about his performance. “My fall cost me a broken ski and a pole,” said Anton Gafarov, adding that he decided to continue fighting for the finals despite all the difficulties.

Gafarov believed the race should be finished in any way possible. “It was a matter of principle to hold on to the end,” he added. He is not devastated (毁灭) by his failure and is eager to take part in the next Winter Olympics despite back problems due to injuries.

10 . Most of the teenagers today have realized the importance of physical activity. There are dozens of far-reaching benefits that sports can bring into their lives. Aside from providing an excellent form of exercise, organized sports can teach a young person some essential life-long lessons.

With lots of junk food at their fingertips, teenagers today often battle with eating. Playing a sport can act as great motivation for them to eat nutritious (有营养的) food. In order to participate fully in sports, teenagers have to have a balanced diet. Learning to eat properly and sleep correctly are important lessons that carry on to their adult lives.

Most teenagers have to deal with the stresses of popularity, appearance and fitting in. Participating in sports, however, can help them develop a positive self-image. If one struggles to feel like they belong, joining a team is a great way to give him or her social interaction that will eventually lead to a group of friends.

Team sports aren’t just about developing skills for their games. Those who participate in team sports will learn the benefits of working hard, setting goals and following rules. When teens have a coach they respect, they can also learn to listen to authority and work hard toward a common goal. Additionally, learning to deal with losses is as important as winning with dignity. A teen who learns that losses are a part of life will be able to face any difficult challenges waiting for them later in life.

Thousands of studies all agree that students feel more connected with their school and are motivated to work harder in class if they participate in sports. Sports give teens the opportunity to be around competitive people and gain an appreciation for hard work. Of course, participating in sports may also teach teenagers how to balance between two equally important things-like schoolwork and sports.