Olympic mettle: athletes who overcame barriers to get to London

One is a marathoner who, until four years ago, had never heard of the Olympics and was forced to borrow running shoes to compete in local races in the malevolent mountains of Peru. Another is a middle-distance runner from Somalia who used to have to avoid sniper fire while training along the "road of death" in Mogadishu. A third is a young weightlifter from Iran, built like a cask, who carries the pride of a nation quarreling with the West on his stevedore shoulders.

While most people who watch the London Olympics will be following the marquee names and story lines – swimmer Michael Phelps's quest for medal immortality, sprinter Usain Bolt's defiance of the limits of human speed, the next queen of gymnastics – many other athletes will provide notable narratives for what they have accomplished just to get to the Games.

Many of these are people you've never heard of, who nonetheless may end up on a podium with medals and a lifetime of dreams draped around their necks. Others will remain anonymous, known only to loyal followers in their home countries. But all come with powerful stories of having overcome great adversity or carrying additional burdens just to compete on the oval tracks and padded mats of London.

They, in fact, embody the spirit of the Games as outlined in the Olympic creed: "The most important thing in the Olympic Games is not to win but to take part, just as the most important thing in life is not the triumph but the struggle." Today and over the rest of this week, we profile eight athletes notable for their journeys to, as well as their potential success in, London.

Sunday:  

Gladys Tejeda: Getting to the Olympics on borrowed shoes

Monday:  

Hiroshi Hoketsu: A Japanese Olympian defies the age barrier

Kayla Harrison: An American Olympian rebuilds a life through judo and friends

Tuesday:  

Mohamed Hassan Mohamed: Training for the Olympics in the shadow of war

Behdad Salimi: An Iranian Olympian carries the weight of a nation               

Wednesday: 

Yamilé Aldama: A British track star jumps through a tough decade

Geeta Phogat: How an Indian wrestler defied gender taboos

Thursday:

Tahmina Kohistani: Afghan sprinter tries to beat the clock - and pollution