virtuous
1 adj A virtuous person behaves in a moral and correct way.
(=good)
Louis was shown as an intelligent, courageous and virtuous family man.
2 adj If you describe someone as virtuous, you mean that they have done what they ought to do and feel very pleased with themselves, perhaps too pleased. I cleaned the flat, which left me feeling virtuous. ♦
virtuously adv `I've already done that,' said Ronnie virtuously.
virtuous circle
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. n-sing
(Antonym: vicious circle)
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.