Here’s an idea one of the people I coach gave me. A 30 day squat, plank and push up challenge.
Each day, after you get up and before you do any thing else, do these:
It’ll clearly take more time as you go on, but it’ll be a good challenge.
Who’s up for it?
Ps: I missed out sit ups as I think there are much better things to do, and the three exercises above cover the full body.