"IMCO" I just made it up, especially for me, because I'm worth it.
Yes, press-ups are fine, but soon enough they won't do very much, wrap a weight plate in a towel and stick it in a ruck-sack, whack it your your back to add some weight. Also, try it with feet raised to target the upper chest more.
Home dipping ingredients:
2 ounces of chairs
10 pinches of text books
An equal number of J-cloths
How to cook: Books on chair seats, damp clothes between books.
That's a starter and main course right there. Next week: How to cook a chicken using lifting metaphors.