Until then, give this little workout a try. I'll be damned if it doesn't get your heart rate up and sweating.
As always, do what you can with good form. I don't care if it takes you all day to get all of the push-ups done. Just do it! It doesn't require any equipment and minimal space. No excuses!
It may not be anything fancy but at the end of 5 rounds you'll have done 150 squats, 100 sit ups and 50 push-ups!