Running is one of the most popular sports all over the world.It is because running doesn't need too many apparatus.All you need is only a pair of running shoes,T-shirts a,etc.Also,running can burn a lot of calories.However,it is easy to get hurt.So,warm-up exercises are recommended.Swimming is another popular sports,especially in Summer.Swimming is recommended by doctors,as swimming requirs whole movement of the body,so it is the best sport.Also,we can swim all the year,no matter the weather is hot or not.