Keeping fit

Nowadays, many people try to keep fit and it is really popular. There are so many ways to keep fit. Some people like running in the morning, others try to do exercises at home, sometimes people even can be on a diet. To my mind(As far as I'm concerned), sport is the best way to keep fit, because diets can cause different disorders. Only after consulting to the doctor can you  start the appropriate diet. For my part, I do athletics and try to rarely eat unhealthy food. To sum up(In brief/ All in all), keeping fit is a good thing, but we should do it correctly.

There are some small mistakes in grammar but it's still a pretty good writing.