With the Olympic games approaching, athletes all over the world are training hard and dreaming of gold, silver or bronze.

Many of the athletes have overcome great adversity to reach the pinnacle of their sport.

But few have travelled as far, or gone through greater hardship, than young South Sudanese runner Lopez Lomong who is training to represent the US in the London games.

Al Jazeera's Rob Reynolds reports from Beaverton, Oregon.

Source: Al Jazeera