Start SLOW. Don’t over train in the beginning and depending on your level of fitness run a little longer every few days to acclimate your body to the activity. Eat healthy, get lots of rest and buddy up with other runners. Subscribe to a magazine like Runner’s World. And just as other’s have said don’t forget to stretch before and after the run. Don’t neglect the cool down period either. Listen to aches and pains your body signals and invest in some ice packs to ice after a run to keep down swelling. If you have knee and/or joint issues, train with weights 2–3 times per week to strengthen those areas to prevent injuries and wrap before a run in a clean Ace bandage.