I used to walk along Han River FOR about 2 to 3 hours in ON the weekends, because Han River IT is near my house. Sometimes in the morning while going to THE office or in the evening coming home I usUally walk through THE streets FOR about 30 minutes. DURING THOSE TIMES, When walking through the street  THERE'S a lot of EXHAUST FUMES COMING FROM VEHICLES WHICH I HAVE TO car smoking out, and I should endure. some dust outside. But I believe it is THE EXERCISE IS good for me. In the summer time because the sun is too RATHER shiny AND HOT, walking OUTSIDE CAN BE is difficult. In the AT WORK, DURING lunch time I walk about 30 minutes a day. Sometimes I walk alone, AND sometimes walk WITH FELLOW WORKMATES. together. When walking alone, I use the time studying Chinese. To do this, I always listen to MY MP3 on my cellphone. When walking together with my co-workers, WE usually talk together. while walking. DURING WEEK DAYS In work day I plan TO WALK one hour for a day.  But If it'S rainy HOWEVER, I cannot DON'T walk. In the summer time BECAUSE I SWEAT A LOT, I PREFER NOT TO WALK AT LUNCH TIME. I cannot walk during lunch time because of too much sweat.