Will not work....Sorry to break the news to some of you trying to use push-ups and sit ups, etc in the place of all out sprints. Tabata/HIIT/Guerilla cardio is based on all out sprint work. Pretend a Lion or a Bear is chasing you. The total breathlessness, feeling of suffocation from lack of oxygen, etc. is not even close to Push-up sprints. things such as mountain climbers, or burpees are much closer to a total exhaustion exercise but still don't hold a candle to proper sprinting either up a hill or on a flat track. Even going to the gym and using a treadmill or eliptical trainer isn't quite the same. But is probably the closest you can come to sprint training outside. It's natural for people to try and find some other "easier" method of doing something hard, but this is ridiculous. Of course nobody would admit that doing push ups and sit ups, etc. is finding an easier way of getting the same/similar results as doing the sprint training. But sorry, you are finding an easier way that is NOT Tabata training. Cross training with plyometrics, circuit training, etc. should be done....IN ADDITION to traditional tabata sprinting, not in lieu of.