1 . As is known to all, sports are necessary, but many people are worried about getting hurt in sports. The equipment（装备）you wear while taking part in sports and other activities is key to avoiding injuries（受伤）.

Start with helmets（头盔）. They’re important for sports and activities such as football, baseball, softball, biking, horseback riding, skateboarding, inline skating, skiing, and snow boarding—to name just a few.    1    Every helmet should be replaced after any accident, as there can be more problems you can’t see.

    2    Sports participation（参与）is the leading cause of eye injuries in teens, but proper fitting protective eyewear can reduce the risk of serious eye injury by 90%. Don’t just wear your regular glasses when you’re on the court or field.    3    

Wear a mouthguard if you play a contact sport where head injury is a risk, such as football, basketball, volleyball and boxing.    4    They can be fitted for your mouth by a dentist（牙医）or bought at sports stores.

And last but not least, the right footwear can keep you from tripping and falling. You know that sports like football, baseball, softball, and soccer require cleats（防滑鞋）.    5    Ask your coach or doctor what shoes are best for your sport.

3 . Teenagers' busy life can cause them to see exercise as a waste of time. However. the belief is far from true. Exercise is important for teenagers because it not only promotes physical health. but also improves mental health.

Exercise plays an important role in a teenager's mental health. Teenagers who exercise tend to have a better body image than those who don't, which helps build confidence and makes one feel more comfortable. This also helps one to accept his or her looks. Although physique(体形)is not as important a factor as health,it can strongly affect teenagers' mood and attitude. A healthier and fitter body will build a greater sense of confidence in the body image.

Another mental benefit from exercise is the feel-good endorphins(内啡肽)that come along with it. The body produces endorphins naturally when one exercises hard that are commonly referred to as"a happy chemical". They can produce a feel-good effect and create a sense of emotional well-being during and after exercise. They can make physical activities more enjoyable. They can also reduce stress and relax one to a point at which it is even easier for one to fall asleep.

Many students say that they are too busy with schoolwork to exercise. but they don't realize that exercise can improve their mental performance. Exercise such as walking and jogging increases the flow of oxygen to the brain and heart. Teenagers who exercise regularly tend to have the ability to think more clearly and faster, In addition, teenagers that exercise regularly tend to be more focused and perform better in school. Various mental issues can be aided by exercise as well, For example, one who suffers from anger issues may look to exercise as an outlet. Teenagers who struggle with anxiety and depression can also find a healthy outlet through exercise.

5 . Whether you’re working out to lose weight or have a beautiful body, it is necessary to have the right ideas. You may often get some suggestions from some people.     1    

Myth (误传) 1: To stay in shape, you only need to work out once or twice a week.

Truth: Once or twice a week won’t make you stay in shape.     2     It is better to do it every day, because we find that the act of sitting counteracts (抵消) any of the activities you do.

Myth 2: The best time to work out is in the morning.

Truth: The best time for a workout is whatever time allows you to exercise most often. And you should make physical exercise a habit.     3     If you prefer a morning run, do that instead.

Myth 3:     4    

Truth: If you want to lose weight, you shouldn’t think that you can simply make it through exercise. Experts say losing weight almost always starts with changes in your eating habits. In terms of weight loss, diet plays a much bigger role than exercise.

Myth 4: Running a marathon is the ideal way to get fit.

Truth:     5     You can get many of the benefits of long-distance running without ever passing the five-mile mark. Running fast and hard for just 5 to 10 minutes a day can provide some of the same benefits as running for hours can.