This is funny. I once had a conversation with someone who always worked out in the loose spare time we all have. I remember what he said down to the last word:
"Waiting for the microwave? Time for some push ups.
In a video game lobby, looking for a match? Get the dumbells out"
This is actually pretty clever. I mean if you live with someone, and they see you doing push ups in the kitchen while you're waiting on food, their first reaction will be pretty awkward