At the age of 26, Kaina Martinez was the sole female athlete on the Belize Olympic team. She made her first appearance in the Olympic Games. Martinez qualified for the London Games because her quickest time of 11.74 seconds, set at the 2011 Central American Championships in Athletics, was 0.36 seconds slower than the "B" qualifying standard for her contest, the women's 100 metres. Before the Games she stated that she felt satisfied and attempted not to get excessive anxiety by relaxing and mediating. Martinez was drawn in the second heat in the event's preliminary stage, finishing second out of eight runners, with a time of 11.81 seconds. Her time allowed her to qualify for the first round. Overall Martinez ranked 51st out of 78 athletes and failed to go through to the semifinal after finishing 0.81 seconds slower than the slowest qualifier in round one. Afterwards she said: "It's an awesome experience. I mean words can really describe honestly how I feel being here and being a part of the competition. I just think it's an awesome experience."