I couldn't run on Saturday because of snow so I knocked out some good old fashioned burpees. 15 sets with a minute rest between. I did 15 reps the 1st set but that was a bit much so 10 reps for the next 14 sets. 155 reps in a little over 20 minutes.
I'm thinking a weight vest could be added. Dumbbells could be used. Add a pushup at the bottom.
Does anyone still do these? If not, what are you doing for conditioning work when stuck inside?