If you describe a situation as a virtuous circle, you mean that once one good thing starts happening, other good things happen, which cause the first thing to continue happening.
Exercise creates its own virtuous circle. You feel so good you want to continue.
...a virtuous circle of investment and growth. [+ of]
virtuous circle in British English
(ˈvɜːtʃʊəs ˈsɜːkəl)
noun
a recurring cycle of events with each one having a beneficial effect on the next
Exercise creates its own virtuous circle. Once you start a programme and do it regularly,you'll feel so good you'll want to continue.
a virtuous circle of investment and growth
Examples of 'virtuous circle' in a sentence
virtuous circle
The virtuous circle of good results leading to consistent selection leading to good results changed the team dynamic.
Times, Sunday Times (2012)
It was a virtuous circle, and one which would not exist without the Bank.
Malcolm Balen A VERY ENGLISH DECEIT: The Secret History of the South Sea Bubble and the First GreatFinancial Scandal (2002)