i've decided to start jogging because i'm getting fat. i've stopped playing soccer because i broke up with my soccer buddies and my tennis buddy is too busy to play more than once a week. i'm now a 35 waist whereas i'm usually a 32-33 at this time of the year. anyway, i bought some new balance m880 shoes and they fit like a dream. my plan is to go to the park and run around the soccer field every morning. i'm doing this in an effort to avoid knee injuries or any of the other problems associated with running on pavement. so, now the question. why don't i see more people running on grass? especially for those who run longer distances every day, is running on grass safer? please advise.