For a break between sessions and for exercise you can do at home, there are some wonderful websites you can use.
One I particularly recommend is Les Mills on demand. Born to Move is a program designed specifically for children , its a mixture of dance, martial arts and yoga put into a 25 minute workout that the children can copy, they just need a little bit of space. It’s great fun for adults too. Not all of the videos are free to access, just the ones without a padlock symbol.
If you as an adult usually enjoy going to the gym or exercise classes and these are cancelled, I can highly recommend a subscription to this site for all of the other exercise sessions – it’s amazing for exercise at home and it seems they’re doing a 4 month free trial which is a bargain! Might help with the cabin fever! There’s aerobic style classes, weight training, dance, yoga – loads of great quality stuff.
https://watch.lesmillsondemand.com/born-to-move/season:4
Lots of children may remember cosmic kids yoga too.