Having overcome an ongoing heart condition to power his way to 100m freestyle gold at Rio 2016, it is little surprise to learn that Australian swimmer Kyle Chalmers is not allowing the current COVID-19 shutdown to cause him any unnecessary palpitations.

At the Antwerp 1920 Games, Hawaiian champion Duke Kahanamoku became the first swimmer to win the Olympic 100m freestyle twice in a row. This came after his first title eight years earlier in Stockholm. He went on to claim a silver medal in the event at the 1924 Olympics in Paris, and is also known and honoured throughout the world as the man who popularised the sport of surfing.

Nathan Adrian of the United States competes in the Men's 100m Freestyle Final on Day 5 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 10, 2016 in Rio de Janeiro, Brazil.

Nathan Adrian of the United States competes in the Men's 100m Freestyle Final on Day 5 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 10, 2016 in Rio de Janeiro, Brazil.

Refugee swimmer Rami Anis during the men's swimming 100m freestyle at the Rio 2016 Olympic Games at the Olympic Aquatics Stadium, on 9th August, 2016.

Refugee swimmer Rami Anis during the men's swimming 100m freestyle at the Rio 2016 Olympic Games at the Olympic Aquatics Stadium, on 9th August, 2016.

Refugee swimmer Rami Anis during the men's swimming 100m freestyle at the Rio 2016 Olympic Games at the Olympic Aquatics Stadium, on 9th August, 2016.

(L-R) Silver medalist Pieter Timmers of Belgium, Gold medalist Kyle Chalmers of Australia and Bronze medalist Nathan Adrian of the United States pose on the podium during the medal ceremony for the Men's 100m Freestyle Final on Day 5 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 10, 2016 in Rio de Janeiro, Brazil.

(L-R) Cameron McEvoy of Australia, Nathan Adrian of the United States and Kyle Chalmers of Australia compete in the Men's 100m Freestyle Final on Day 5 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 10, 2016 in Rio de Janeiro, Brazil.

Nanjing 2014 - Gold medalist Shen Duo(C) of China,silver medalist Siobhan Bernadette Haughey(L) of Hong Kong, China and bronze medalist Qiu Yuhan of China pose on the podium during the awarding ceremony for the women's 100m Freestyle final of swimming event of Nanjing 2014 Youth Olympic Games in Nanjing, capital of Jiangsu Province, on Aug. 19, 2014.