Most people    1    that regular exercise does wonders for the body and mind — but what exactly are its health benefits? To start with, physical activity increases the    2    of your heart and lungs. During exercise, your heart and lungs must work harder. This extra effort makes them grow stronger over the long term. It has also been proven that active people tend to have better immune systems and are at lower    3    of diseases. Moreover, exercise is good for your mental health. Working out can help you reduce    4    and get over    5    feelings. Some studies even show that exercise improves certain brain    6    , meaning you could actually exercise your way to better performance at school!

At the ancient Olympics,by    1     the athlete were all men and they had to compete     2     no clothes.Single women were allowed to take part in their own     3    ,at a separate festival in honour of Hera,the wife of the Greek god Zeus.Today,both male and female athletes from around the world can take part,no matter what nation they come from. The     4    Olympic were first held in 1896,in Athens.It was a Frenchman,pieere de Coubertin,who brought the Olympics back to life.He dreamt that the Olympics would make it possible for people of all countries to live side by side in     5    Now people all over the world are helping to realize this dream.Among them are many well-known athletes.