In the UK, the law allow people who are not isolating to go outside for exercise, safely, carefully. Walk/roll, cycle or run.
I've seen a few instances of 'stay in your garden!' from various sources. I want to talk about this. A thread/

Some 3 million households in the UK don't have a garden. Many of them are from the poorest households, and their tiny room or flatlet might have a view of a brick wall. The World Health Organisation is clear that green spaces are important for wellbeing. https://www.who.int/sustainable-development/cities/health-risks/urban-green-space/en/

The first picture on this thread is a reality of a 'garden' for a lot of people. For sure, if self-isolating or shielded, that is the only outdoor space. But, there's problems, for many.
For a start, in tiny back alleyways with poor air flow, coughed out virus might spread/

We'd also have to consider privacy (often none). Prejudice for minorities being stared at from 20 windows in surrounding houses. Noise from all those squashed-together spaces. Not a tree or bird to be seen in many. The smell of drains or rubbish bins/

For wheelchair users, so many gardens are completely inaccessible. It may take them all the power and might they have to get services to put in a ramp to the front door. Garden? No way. So, out the front is the only way to get some fresh air safely/