One of the best and most effective ways to shake up your current workout program and burn mega calories is to try interval training. A type of cardiovascular workout, interval training can supercharge your endurance, strengthen your heart and lungs, and help burn calories at a faster rate.

Try this 30-minute interval training workout provided by the exercise experts at Fitness Town and Life Fitness:

Spend at least the first three minutes on the treadmill at an easy warm-up pace, slowly working your way to a moderate pace. On a scale of one to 10, (one being a stand still, 10 being an all-out sprint) moderate pace means you are working at about a six.  Next, add either speed or incline and work very hard for one minute - this will be a nine on the previous scale. Then take the treadmill back down to a moderate pace and spend three minutes recovering. Repeat six times and spend five minutes cooling down, working at about a two.

Keep in mind that you can repeat the interval as many times as you wish and remember to always end with active recovery. Don't just stop dead in your tracks - keep your feet moving and breathe deep to bring your heart rate to a comfortable zone. Of course, stretching at the end of a workout is always a good idea.