The British government on Sunday warned that outside exercise could be banned if people flout stringent guidelines to cut the spread of coronavirus infections.
The UK government on March 23 ordered a three-week shutdown of non-essential shops and services to cut close-contact transmission of the virus.
But warmer weekend weather has stoked fears that people could congregate in parks and open spaces, potentially threatening any gains made in cutting transmission rates.ark was closed on Sunday after concern about high numbers of sunbathers on Saturday.
Health Secretary Matt Hancock, who himself tested positive for COVID-19, told Sky News television that sunbathing was "against the rules" and anyone doing so put lives at risk.
He told the BBC most people were following guidance only to leave their homes to shop for essential supplies and medicine, and to exercise once a day.
But he said it was "quite unbelievable" that a minority were not.
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"The truth is the more people go out from home, the more the virus spreads," he added.
"I don't want to have to take away exercise as a reason to leave home because people are not following the rules...
"If the result of that is that too many people go out and flout the rules I'm afraid we'll have to take action."
Calderwood, who fronts a public advertising campaign urging Scots to stay at home, told a news conference: "What I did was wrong. I'm very sorry. It will not happen again."
She added: "This was a mistake. Human error. And there's no excuses. I should not have done what I did."