I understand that different people have different physical body shape, that's actually the first trick to look at when talking about keeping fit. In the Chinese tradition, there are 'yin' and 'yang' body types. For 'yin' people, they feel cold easily, sometimes their hands and feet are so cold no matter how much clothes they put on, they are usually relaxing and easy-going people. For 'yang' people, you can say the other way round, they're hot tempered, warm-body and sweat easily. Different body types thus should have different diet.
Diet, there are many websites talking about different types of diet, especially for people who wants to loss weight. I'm not going into details here. But for people with different physical shape, diet can be a critical part to stay healthy and fit. As mentioned, 'yin' people feel cold easily, so try to avoid cold drinks or cold food like ice-cream. If take too much, ‘yin’ people may feel dizzy or weak afterwards. For 'yang' people, deep fried stuff is the killer. It is difficult, but it is a matter of persistence. To them, taking too much this kind of food will lead to pimples or mouth ulcers.
Persistence, our third trick. To be persistent, especially regarding how to lose weight or how to keep fit, it is better tell your plan to your friends and family so they can give you the support. On the other hand, you must remind yourself how good to be healthy and look great all the time. Set a target, e.g. not to fall sick during the flu season or lose 5 lbs within a period of time, etc. If you achieve your goal, maybe then you can give yourself a little treat. This will keep you motivated.
Metabolism rate is another trick to help you achieve your plan to keep fit. As we all know, metabolism rate is the mystery dominating our body shape and recovery rate, too fast or too slow is not the best for us, but how to keep it at a steady rate? Sleep and exercise are the keys. Without sleep or rest, our metabolism will slow down, causing us to gain weight easily. According to research, it is better that we have 6 hours of sleep every day, the best before 12 as our kidney can cooperate to cleanse the body. Exercise can make our metabolism goes faster, so as to burn extra calories, 2 hours per week is the optimal.
Lastly, have a yearly body check. If you want to master your body, you have to understand it. As you know, some skinny people do have a high cholesterol rating! This can be quite dangerous to the heart. So it is always a good idea to have a body check up. It can also be a good time to have free consultation with the doctor regarding some tips on keeping fit!
Hope the above 5 tricks to keep fit can help you to stay out of flu and influenza. Before getting into a certain type of diet, please take the following test: http://www.diet.com/tracking/index_c.php?id=1611