Which double Olympic athletics gold medallist was nicknamed 'White Lightning'?

Alberto Juantorena, known in Cuba as 'El Caballo' and 'White Lightning' the world over is best known for his incredible achievement at the 1976 Summer Olympics where he became the first and so far only athlete to win both the 400 and 800m Olympic titles.

As a fourteen year old he was 188 cm or 6 ft 2 in tall so he was at first ushered into Basketball but Polish track coach, Zygmunt Zabierzowski, convinced him to start running seriously. Describing himself as a ‘bad’ basketball player, he took to the sport with enthusiasm. Less than one year later, Juantorena was eliminated in the semi-finals of the 400 m event at the Munich Olympics in 1972.

Four years later he was entered in both the 400m and the 800m. Juantorena had only taken up 800m that season so few predicted he would do well. He made it to the Olympic final, and led the field for most of the race, eventually winning in a world record time of 1:43.50. Only three days later, he also won the 400 meter final, setting a low-altitude world record of 44.26. In 1977, he set another world record in the 800, running 1:43.44 in Sofia at the World University Games where yet again he completed the 400m and 800m double.