For shaped stomach are necessary 2 minutes a day, so you have no more excuses.
It is one exercise that is simple to perform and you do not need special equipment.
The plan for combination of the exercise and rest are as follows:
2 days, you should be doing the exercise for 20 seconds.
3 days, for precisely 30 seconds.
The 6th day you should take a break.
Next 3 days, do it for 40 seconds.
2 days do the exercise for 1 minute.
12th day take a break.
13th day do it for 1 minute.
The next 3 days, you do 1 minute and 15 seconds.
17th day you do it for 1 minute and 30 seconds.
Then resting 1 day.
2 days, precisely for 1 minute and 30 seconds.
And, 3 days for 1 minute and 45 seconds.
24th day you rest.
The next 2 days, exercise for 2 minutes.
27th day relax again.
On the 28th day to do as much as you can (over 2 minutes)