the Athletissima Diamond League superstar Usain Bolt posted short video on social media . Six-time Olympic gold medallist is training for a busy 2015 summer . His post included a Muhammed Ali quote about suffering for success . Bolt is already confirmed to run in France and Switzerland in July . He will target the world championships in Beijing in August .
Sprint superstar Usain Bolt posted short video on social media . Six-time Olympic gold medallist is training for a busy 2015 summer . His post included a Muhammed Ali quote about suffering for success . Bolt is already confirmed to run in France and Switzerland in July . He will target the world championships in Beijing in August .