It is a high intensity training that can shred mega calories in a short amount of time. Roughly 400-600 calories in 1 hour give or take your weight, endurance and intensity you put into it. Plus, there is an after workout burn that continues long after you leave the gym.
Basically you choose a fast paced movement and give it your all for 20 seconds, rest for 10sec. Do as many rounds as you can; while incorporating strength and conditioning moves. This brings your heart rate down a little bit before you kick it back up. This up and down heart rate causes your body to work hard and burn fat faster.
As you get more endurance you can choose to bump up the time a bit to 30s on, 10s off.
Note 3500 kcal=1#. So doing this plus cutting calories you can easily drop 1-2#/ week.
This is my favorite way to get my sweat on.
In order to lose fat you have got to push yourself. You have to keep your body guessing and working hard. If you go for a jog everyday your body will become more efficient and the overall burn lessens.
Pinterest is my favorite go to place for workouts.
These are some of my favorite Tabata ideas.
And here is just a list of idea mix and match to suit your ability and needs. If you don't know what something is ask or google a video to show you how.