The outdoor activity I'd like to talk about is tennis, my favorite sport. I started learning tennis when I was 16 years old. It was difficult at first, but I got better as I practiced. 1.是什么运动Tennis is a sport usually played between two players or between two teams of two players each. Each player uses a racket球拍 that is strung to strike a hollow rubber ball covered with felt over a net into the opponent's court. 此户外活动怎么进行Tennis is an Olympic sport and is played at all levels of society at all ages. The sport can be played by anyone who can hould a racket, including people in wheelchairs. I myself have seen disabled people play tennis. They sit in specially-designed wheelchairs and their rules re a bit different, such as hitting the ball back after it bounces twice. Tennis is enjoyed by millions of recreational players and is also a hugely popular worldwide spectator sport, especially the four Grand Slam tournaments: the Australian Open played on grass courts.此活动受欢迎程度 I often watch tennis games with some of my friends, who are also interested in playing. We all think it's a very elegant sport and it's entertaining, educational and teaches us team spirit.