When you’re crunched for time, training with purpose gets difficult. Such occasions call for 30-minute HIIT workouts that make the best of a bad situation. Instead of winging it, come prepared with effective routines that do the most with what you’re working with. Turning to high-intensity interval training—implementing a high work to rest ratio that keeps your heart rate elevated for most (if not all) of the session—helps train your conditioning and elevate your metabolism to trigger fat loss. Now who wouldn’t want that? Bookmark these killer 30-minute HIIT workouts. They’ll get you fired up in no time.