One of the reasons people procastinate is the work seems like too much and time consuming. If you promise yourself to do 5, 7 15 or 20 minutes you must stop at the end. Stand up stretch and then decide whether to give it some more time. If you don't stop you're breaking a promise to yourself.
If you habitually go over the time you've set your mind will become reluctant to even start for 5 minutes and you will feel like you have a doozie of a procastination problem.
Alex
