Dr Norman Swan, who is a medically qualified journalist, says gyms are the perfect place for the virus to spread because they are full of sweat.
Dampness is a bad thing for spreading germs. You've got these big blokes pumping away and you never know, one of them might be a super spreader,' he told the ABC.
He urged people to avoid steam rooms because the room would not be hot enough to kill the germs.
'I wouldn't go near any humid area to be honest.'
Those who have symptoms, including coughing or sneezing, should avoid heading to the gym until they are well.
However, Dr David Thomas, a professor of medicine and director of the Division of Infection Diseases at Johns Hopkins University School of Medicine, told the New York Times, church-goers were more at risk than gym junkies.