It can be done, but it is not easy. Take a look at an article posted by Medhi about Ramadan & Weightlifting. While you aren't weightlifting, some of the principles can be applied in your situation. The high points will be listed below:
- Train 2 hours before you break your fast. That way you can get several meals in to help your recovery.
- Reduce your training load. You simply won't be able to recover as fast.
- Nap to preserve energy and get the rest you need
Now, if you intend on running, that will dehydrate you something fierce. In that case, I recommend changing Medhi's advice to training at the time you break your fast. That will allow you to remain hydrated, and get some serious food in you right afterwards. He even provides a schedule to help plan your day in the article.
That said, you will need to eat some caloric dense foods, and food with plenty of protein.