4 . 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.

5 . It's the start of a new year, when your fitness goals are set and you engage in the challenge.     1     Their standards of “too big” are not even achievable in their lifetime, let alone a few months of training, which brings my tips.

Set realistic goals! The process of building muscle is an absolutely slow one that requires strong will to gain. Consistently causing protein synthesis （合成）in specific muscle fibers will allow muscle to develop. However, all individuals are not equal in the process.    2     Gaining muscle will happen quickly to a new gym-goer, but take a long time for someone that has been training for years.

Stick to specific training for the goals you set to achieve.     3    This will require you to restrict the diet, and it will prevent you gaining muscle. Diet reflects the training load. The training reflects your goals. It's like swimming upstream, think strong, fast and flexible. If you are running a marathon, the goals are different and train accordingly!

    4     Fat has taken some time to develop, so it will not be lost overnight. Allow the hormonal triggers （生理诱因）in the body to work more efficiently to regulate volume of food. Taking out additional sugars is one of the most important steps to regulate volumes of food to switch off desire for food.

Once a goal is reached, do not go back to what you did before. When people finish their transformation, the hormone profile is very weak to fat deposition （沉积）。Every training session should be a step toward a lasting transformation, with a diet improving the level of exercise.     5    

6 . Make Your Fitness Resolution Stick

Last year, the most common New Year’s resolution was fitness-related. A study showed that approximately 50 million Americans swore to increase activities and lose weight.     1    , success was hard to achieve. Two months later, only 37 percent of people in their 20s and 16 percent over age 50 had kept to their new fitness habit.

    2    , the benefits of such a change are clear. There is no question that exercise plays a role in the prevention and treatment of many diseases. Weekly exercise routines have been shown to reduce rates of depression and anxiety, lessen risk of heart attacks and strokes, and reduce the high rates of diabetes.

    3    . It’s suggested that 150 minutes per week of moderate intensity exercise like swimming, or 75 minutes per week of intense exercise, like jogging, should be the minimum amount exercise needed to achieve maximum medical benefit if you stick to it.

Often, the best way to increase your exercise is to involve movement in your everyday life. On average, urban citizen who go to work by bike or public transportation are fitter than suburban citizens who drive to work.     4    . They are good ways to increase the amount of your movement every day.

Whether you determine to work out at your local gym three times a week, take 10,000 steps a day or give your dog an extra walk every day, what matters most is not your commitment to exercise but your sticking to it.     5    .

7 . Swimming, cycling, jogging, skiing, dancing, walking or any of dozens of other activities can help your heart.    1     Whether it is a structured exercise program or just part of your daily routine, all exercise adds up to having a healthier heart. Here are some tips for exercise success.

●Choose activities that are fun and add variety. Develop several activities that you can enjoy.    2    

●Wear comfortable, properly fitted shoes and comfortable, loose-fitting clothing appropriate for the weather and the activity.

●Find a convenient time and place to do activities.    3     If you miss an exercise opportunity, work activity into your day another way.

●Use music to keep yourself entertained.

●    4     Decide what kind of support you need. Do you want them to remind you to exercise? Exercise with you regularly or occasionally? Be understanding when you get up early to exercise? Spend time with the children while you exercise? Try not to ask you to change your exercise routine? Share your activity time with others. Ask your family members, friends or co-workers for help.

●Don’t overdo it, especially at first. You can slowly increase the time and intensity (强度) of your activities as you become more fit.    5    

●Keep a record of your activities. Reward yourself at times. Nothing will inspire you more than success!