1. Don't consider running a marathon unless you are in good physical condition.
2. Don't leave training until just before the marathon in case you injure yourself.
3. Take time off from running every week otherwise your body will not have a chance to rest.
4. As long as you train carefully, you can avoid injury.
5. Assuming you are sensible, you should run a marathon safely and successfully.
HỌC TỐT!