Nah it's mostly that my living space has shrunk and it has been raining for three days so even outside is not an option. 100 is easy, finding the motivation is the difficult part.
Doing 200 angry pushups in the mud and freezing rain is something close to @GoatsShadow's wet dream... you better straighten up and fly right before he reaches 1000 in a day and comes over to beat the shit out of you.
I still think 100 was unsustainable. If you're uninjured just do one set a day, that's enough to still be improving. If you like doing nothing, maybe try fasting instead, apparently less than a week is healthy...