Chat with us in Facebook Messenger. Find out what's happening in the world as it unfolds.

USA's Michael Phelps celebrates with his gold medal during the podium ceremony for the Men's 4x200m Freestyle Relay Final as part of the swimming event at the Rio 2016 Olympic Games at the Olympic Aquatics Stadium in Rio de Janeiro on August 9, 2016.   / AFP / François-Xavier MARIT        (Photo credit should read FRANCOIS-XAVIER MARIT/AFP/Getty Images)
USA's Michael Phelps celebrates with his gold medal during the podium ceremony for the Men's 4x200m Freestyle Relay Final as part of the swimming event at the Rio 2016 Olympic Games at the Olympic Aquatics Stadium in Rio de Janeiro on August 9, 2016.   / AFP / François-Xavier MARIT        (Photo credit should read FRANCOIS-XAVIER MARIT/AFP/Getty Images)

    JUST WATCHED

    Before Michael Phelps won gold, he trained with this

MUST WATCH

Before Michael Phelps won gold, he trained with this

A new wearable fitness tracker called Whoop has been used by elite athletes like LeBron James and Michael Phelps and tracks more data than ever before.

Before Michael Phelps won gold, he trained with this

A new wearable fitness tracker called Whoop has been used by elite athletes like LeBron James and Michael Phelps and tracks more data than ever before.