sport is very important in our life, because it can make us keep healthy, what is more, the reasonable physical exercise can relieve the stress from competition.
in my life, I usually play basketball with my friends after school. In summer, swimming is part of my life.
when you study without exercise, it is easy for you to feel tired. because you are not strong.
however, too much exercise is also bad for your study, because you do not have energy to study.
as a result, you can have regular exercise about three times one week and afer few hours' study have a rest.
