Informal exercises you can do
Vacuuming lunges and toothbrush squats
Some time ago Dr. Michael Mosley did a television programme called “Trust Me, I’m a Doctor”. One episode showed a group of people doing a variety of exercises at home with household objects. I found the before and after results amazing.
Have a look and see if there are not some exercises here that you can incorporate into your daily routine. It all helps.
(They also offer a downloadable guide).