The first day of swimming at the Maria Lenk Aquatic Centre went well for Team GB's Adam Peaty, (pictured) who broke his own world record as he reached the final of the 100m breaststroke in 57.55 seconds

Incredible photos of Olympic swimmers at the peak of their fitness

The first day of swimming at the Maria Lenk Aquatic Centre went well for Team GB's Adam Peaty, (pictured) who broke his own world record as he reached the final of the 100m breaststroke in 57.55 seconds

Britain's Adam Peaty reacts after he broke the world record in the Men's 100m Breaststroke heat during the swimming event at the Rio 2016 Olympic Games at the Olympic Aquatics Stadium in Rio de Janeiro on August 6, 2016.   / AFP / GABRIEL BOUYS

Swimming - Olympics: Day 1

Britain's Adam Peaty reacts after he broke the world record in the Men's 100m Breaststroke heat during the swimming event at the Rio 2016 Olympic Games at the Olympic Aquatics Stadium in Rio de Janeiro on August 6, 2016. / AFP / GABRIEL BOUYS

Team GB's Adam Peaty swimming towards a new World Record at Rio 2016

Team GB's Adam Peaty swimming towards a new World Record at Rio 2016

Clockwise from top left: Adam Peaty (swimming), Andy Murray (tennis), Laura Trott and Jason Kenny (cycling), Giles Scott (sailing), Nick Skelton (showjumping), Jonathan and Alistair Brownlee (triathlon), and Jade Jones (taekwondo)

Our glorious golden Games

Clockwise from top left: Adam Peaty (swimming), Andy Murray (tennis), Laura Trott and Jason Kenny (cycling), Giles Scott (sailing), Nick Skelton (showjumping), Jonathan and Alistair Brownlee (triathlon), and Jade Jones (taekwondo)

Adam Peaty | Swimming - Men´s 100m Breaststroke världsrekord 57.13, 2:a Cameron van der Burgh, Sydafrika 58.64, 3:a Cody Miller, USA 58.87

Adam Peaty | Swimming - Men´s 100m Breaststroke världsrekord 57.13, 2:a Cameron van der Burgh, Sydafrika 58.64, 3:a Cody Miller, USA 58.87

He looks like my son! Swimming superstar Adam Peaty, 21, wins Team GB's first Olympic medal

Swimming superstar Adam Peaty, 21, wins Team GB's first Olympic medal

He looks like my son! Swimming superstar Adam Peaty, 21, wins Team GB's first Olympic medal

#RIO2016 - Best of Day 1 - Britain's Adam Peaty takes part in the Men's 100m Breaststroke Semifinal during the swimming event at the Rio 2016 Olympic Games at the Olympic...

#RIO2016 - Best of Day 1 - Britain's Adam Peaty takes part in the Men's 100m Breaststroke Semifinal during the swimming event at the Rio 2016 Olympic Games at the Olympic...

Great Britain won their first medal of Rio 2016 as Adam Peaty took gold in the men's 100m breaststroke with a world record.The…

Great Britain won their first medal of Rio 2016 as Adam Peaty took gold in the men's 100m breaststroke with a world record.The…

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