I also like the 4 minute ab workout on the fabulous app! My goal with that is to be able to hold the plank a little longer each week or so. So while the app has you do it for 30 seconds, its the last thing in the workout, so you could just keep going until you can't anymore!
If I find I've forgotten to work out and I'm already about to shower, I'll do some push ups off the side of the tub before I get in. Done!
OH you know what else I did recently? If you do go to the gym, get on one of those bikes and pull out your phone or whatever you watch shows on, then put on that guilty-pleasure eye-candy trashy show you won't admit you love. The time will fly by.
Hope this helps! YOU'RE GREAT. GO FORTH. BE HAPPY.