From tomorrow.
Not really sure what I think about this.
Literally targeting the people trying to keep themselves in the best possible shape to fight off the disease and not be a burden to the healthcare system?
Or weeding out the rise of the CoronaHobbyJogger who won't bother in the evenings / early morning?
In general I've found runners to be the best at distancing - Seen instances of cyclists continuing to act in their "we didn't get the memo" we own the roads manner, refusing to show decency; Families spread four across, happily blocking trails / pavements to anyone hoping to pass; old people, stopping and chatting face to face to each other (!) pretty much sticking two fingers up to the rest of us who are stuck indoors, losing jobs, etc primarily for their benefit.
Not exactly sure what targeting runners achieves.