Sport plays a big role in our life. many people do sport in our country. they want to stay healthy. in my opinion sport is important for healthy free time. sport also makes people strong and prepares a lot of joy. there are some popular kinds of sports in our country: volleyball, hockey, gymnastics, skiing, skating, athletics. everybody may choose the sport he (or she) is interested in. my favorite sport is the snowboarding. snowboarding — the extreme sport consisting in descent from snow-covered slopes and mountains. i was on many mountains in city boundaries of yekaterinburg and i am going to visit others soon. исправьте ошибки .

In my opinion sport is important for spending your free time in a healthy way. 
Sport also makes people stronger and happier. 

There are some popular kinds of sports in our country, such as volleyball, hockey, gymnastics, skiing, skating, and athletics. 
Everybody can try out a sport that he or she is interesting in. 

My favourite sport is snowboarding. Snowboarding is an extreme sport that is about going down snow covered slops and mountains. I went down many snowy mountains in the city boundaries of Yekaterinburg. I'm going to visit other cities soon too! 

Исправила ошибки и написала так чтобы звучала более natural. 
Если вы хотите чтобы я что-то исправили или объяснила - пишите : )