1 . Teenagers' fitness is now a major concern and physical exercise is very important.     1     Exercise makes your body strong and helps you to keep the right body weight. Sports scientists offer the following advice to teenagers.     2     Then you can design a programme that will help you become healthier.

    3     “Overweight” means that the person gets very little exercise and often has a serious weight problem.“Inactive” means that the person does not join in many physical activities, but is not seriously overweight. “Active” refers to people who participate in sports and other physical activities, but do not have a high fitness level.

According to experts, overweight teenagers should work out to keep healthy. Ride a bike, play volleyball or basketball for a while, and go for a twenty minute walk each day. All these will help to burn calories. Inactive teenagers should do similar activities, but add some bending and stretching exercises, such as push-ups and sit-ups, starting with twenty of each a day. Inactive people can take a little more exercise than overweight people because their bodies are stronger.     4    

Experts also suggest one hour a week or more on running and other forms of intensive exercises, together with fifteen minutes a day spent on stretching and bending activities.     5     Some weight-training and other body-strengthening exercises could also be planned in the programme in order to increase people's strength and safety.

6 . I was born with eye disease. At school I even couldn’t read the blackboard. By the time I got to university, I couldn’t really see images(图像) at all. I just can tell the difference between light and dark. In the first year of my PHD, I was almost 100% blind.

When I was young I used to get very angry if I encountered something I found difficult or couldn’t do because of my eyes. But over time I learned that wasn’t a helpful response. There’s no point getting wound up by the fact that I can’t see, because it won’t change it.

I started climbing when I was young. My dad took me up my first rock route(路线) when I was two. All my early climbing was outdoor traditional climbing. My dad had been in the Mountain Rescue and was part of Mountaineering Club, so we would go for weekends away climbing throughout the UK.

He taught me everything I know and I led my first route outside when I was 11. At this time I could just about see well enough to place rock gear（齿轮）, but not well enough to pick out the routes from the ground. People are usually amazed when they discover that not only do I climb, but I also lead climbs.

At university I joined the Mountaineering Club and was able to climb much more frequently. We had regular trips to indoor walls and weekends away outdoors. I developed a great circle of climbing friends and went on multiple trips to Europe. On these I started Alpine climbing and ice climbing too.

There was a time when I thought I might have to give up leading as my eyesight got worse. But I never thought I would stop climbing. I just learnt to adapt myself to the eye disease with the support of my friends. It’s quite possible that I wouldn’t be as good a climber if I weren’t blind — if I didn’t have these challenges. That concentration and determination is built through my disability.

7 . Unicycles are one-wheeled vehicles that developed from the original bicycle, the Penny Farthing, which consisted of a large front wheel and a much smaller back wheel. When this bike hit bumps(凸块) or suddenly slowed down, the back wheel came off the ground, so many riders learned to balance on just the front wheel. Thus, bicycle-makers began making vehicles with just one wheel.

Some of the benefits of riding a unicycle include burning calories, and increasing your levels of coordination (协调), concentration and balance. Because unicycles don’t have any handlebars, riders must balance, using only their abdominal (腹部的)muscles and leg muscles. This helps you build a healthier core. Long cycling sessions also increase your heart rate, which can lead to a healthier cardiovascular (心血管的) system. Riding a unicycle is an effective way to get in a low-impact workout for those with damaged knees and legs.

Unicycling is a fun activity regardless of your ability level. Riding a unicycle is self-motivating and psychologically stimulating because you will notice improvements each time you ride. Some people find that it gives them feelings of control when they can achieve balancing and riding on just one wheel.

Some riders use their unicycles as their primary mode of transportation for work or school. Because unicycles don't require any type of fuel, you can save money at pump. Unicycles also have only a few moving parts that might break. This means that you typically don't have to spend much money on repairs. You also won' t need to spend money on storing or transporting your unicycle.

Unicycling is a somewhat uncommon activity. Because of this, a sense of unity tends to grow among unicycle riders. Many riders travel significant distances just to go on rides and spend time with other unicyclists. Unicycling is often a family activity, and riding together can bring family members closer.

8 . Some people say that the best way to reduce the size of your waist is to do stomach exercise. Many people believe that when specific muscles are exercised，the fatty tissues(组织)in the immediate area are burned up. The truth is that exercise burns fat from all over the body and not from one specific area. Of course，if you reduce the fat throughout your body，you will certainly see results around your waist，too.

Some people believe that you need to exercise twice a week in order to keep a sufficient level of physical fitness. However，studies directed by American scientists show that unexercised muscles lose their strength very quickly. Within 48 to 72 hours，you must use the muscles again to reestablish(重建)the good physical effects. And what does that mean to you？American scientists concluded that while daily exercise is most helpful，exercising every other day or three days a week will keep a sufficient level of physical fitness.

Is it true that you burn more calories running one mile than walking the same distance？The answer is no. The truth is that you use the same amount of energy whether you walk or run the mile，since in both cases you are moving the same weight the same distance. The speed does not matter. Of course，if you run rather than walk for 30 minutes，you will cover more distance，and therefore，burn more calories.

If your breathing doesn't return to normal within 5 minutes after you finish exercising，you have exercised too much. Five minutes or so after exercising，your breathing should be normal，your heart shouldn't be beating loudly，and you shouldn't be tired.

9 . We are taught from childhood that warming up is a must in preparation for any exercise. It allows us to prepare our muscles for the strain（拉力）we are about to place on them and prevent injury.    1    These all prepare for an effective workout.

    2    It prevents dizziness, helps return the heart rate back to normal and prevents chronic venous insufficiency（CVI）. Also known as "blood pooling", CVI occurs when the blood in blood vessels（血管）expands during prolonged exercise, making it difficult for it to return to the heart from the legs.

According to many health and fitness instructors, the total cool-down period should last 3 to 10 minutes, or until you are ready to stop.    3    For example, if you have been working your legs, you will need to do lower body stretches or a slow walk. There are many helpful tutorials online.

The best way to measure whether you have cooled down effectively is purely based on common sense—if you feel your heart rate has reduced, that's enough. There is no research to prove stretching after a session will help reduce pain, but if you feel it helps, do so.    4    

Cooling down methods, including foam rollers, a sports massage or dry needling, are worth investigating.    5    If the pain is there the next day, consult your doctor, and, more importantly, warm up more thoroughly next time.

10 . Sports fandom is about more than just entertainment. It can boost your self-esteem (自尊) and make you happier — and you don’t have to root for the winning team to gain the benefits.     

Being a sports fan is a “very psychologically healthy activity,” says Daniel Wann, professor at Murray State University whose research program centers on the psychology of sport fandom. Fandom connects us to other like-minded people, which satisfies our human need for belonging, he says.

These relationships are significant: People who identify as sports fans have higher levels of self-esteem, lower levels of loneliness and tend to be more satisfied with their lives compared to those who aren’t interested in sports, Wann says. Fans tend to have more access to social support, help and resources as well. Research suggests that when people have support from their communities, they have better health.

Beyond bonding, fans get to enjoy the psychological benefits of winning, even if they have nothing to do with the players or games, says Stephen Reysen, associate professor at Texas A&M University-Commerce who studies identity and fandom.

“Individuals feel that the fan interest (in this case a sport team) is a part of them,”   Reysen says. “So when the team is winning, you feel like you are winning even though you are not a player.”

Of course, teams sometimes lose.

So, why do people continue to put their faith behind teams that tend to lose? People who feel a strong psychological connection to a team are more likely to root for a team when they’re having a losing season, Reysen says.

“Sports fandom has nothing to do with the outcome of a game,” Wann says. For example, if a pizza restaurant continually got your order wrong, you’d likely switch to a more reliable one. But because being a fan is so central to people’s identities, people are willing to accept defeat and continue to be loyal to a team.

Being part of a fan community can also help people cope with losses. A 2019 study found that watching a football game with other fans helps to ease the negative psychological effects of losing.

“For fans of the losing team, sharing the pain may have protected them from losing self-esteem,” Silvia Knobloch-Westerwick, co-author of the study and professor of communication at The Ohio State University said in a release.