I did 5 sets of 20 throughout the day and did a mixture of kitchen counter pushups and wall push-aways. You may think: Wall pushups, those are nuthin'! But, au contraire, mon ami. If you lean into them and make it a plyometric-type move by explosively pushing yourself away from the wall, they're not nuthin'. They're something! Especially for an RAF!
Now I'm off to go do some corner chest stretches!