Keeping fit and good mental health during lockdown

As the bulk of the nation starts to work from home, what effect can this have on wellbeing and mental health?
With the country entering a lockdown phase, we are all being asked to stay home and only venture out on essential journeys.
This self-isolation will take some getting used to and people will quickly get beyond the ‘holiday-mode’ feeling that some seem to have eagerly embraced.
As a mental health first aider, this is where I wonder how the current Coronavirus pandemic will affect us and I would therefore urge everyone to show as much compassion and tolerance as possible in these strange and difficult times.