In case some pps haven't noticed, I distinguished between living in a house and in places with communal areas.
As I said, each individual going for a short walk or run isn't going to catch coronavirus.
However, if everyone gets out, at some point, parks and tracks have crowds of people as normal. That is not advisable. By any reasonable government. And it hasn't been.
Each one of us has to use our judgement and evaluate their individual circumstances.
If you can go for a walk or your allotment, or wherever, without coming close to people or touching lots of surfaces that can be contaminated, fine, do it.
If you live in a populated area, in flats, or have to come in contact with potentially infected people and surfaces, then stay at home as much as you can.
I live in a country where many people started isolating earlier than government advice, and where people have demanded closures and stricted measures by the government.
Following government advice to the letter and going lalala won't help contain this thing.
Remember that there will be people not following rules at all. If as many of us can be stricter, all the better.