Originally Posted by bronco67

If I don't have time to go to the gym, I go to the baseball field near my house and do Tabata sprints. I have a timer app for my phone to break down when to start and stop. Doing that at full intensity for 8 rounds will almost force you to lay down at the end.

On gym days, sometimes I'll mix HIIT eliptical into the basic cardio. It's the same thing as the sprints. You go all out for 20 seconds -- rest for 10. This goes on for 8 rounds.

You can integrate almost any exercise into the Tabata format -- burpess, jump rope, Hindu squats, pushups -- anything that gets the lungs going.