Interval Training

If a trainer tells you interval training must be done in 30-second... or one-minute... or five-minute increments, he's misinformed. Research shows that all types of intervals will help you burn belly fat better than slow cardio - and there's never been a "head-to-head" study comparing interval workouts of various lengths. But, based on my experience, I have an opinion: I like simple 30-second intervals for fat-loss workouts.

If you do intervals on a cardio machine, it's easy to stick to the 30-second interval timing, followed by a 60-90 second recovery at a much slower pace. If the intervals were any shorter, it would be tough to change the settings on the machine fast enough.

Any type of interval training for fat loss is going to be better than slow cardio - and it allows for faster workouts.