Too busy to workout? Well you can always sacrifice 4 minuets to blast some fat. Here is my 4 minute tabata ab workout. Do the modified version and work your way up to the advanced version. Do it 3-4 times a week for 4 minutes then start increasing the rounds aiming for 20 mins total. I use the Simply Tabata app because you can preset the interval times. Just set it for 20 secs on and 10 secs rest. Remember to push hard, fast and strong. You should be drenched at the end of the 4 minutes. Good Luck!!