Keep going with anything you are doing that is active at home! There are videos on previous weeks or plenty of of other ideas on the internet if you search 'PE at home'.
These games are designed for school but could be transformed for the garden if you use home objects instead of cones. Could the children come up with their own code breaking game for example?
Remember it is really important to exercise and get out in the fresh air! Make the most of this lovely sunshine and stay fit :)