When you fail to plan, you also plan to fail. A good plan is integral to achieving goals and bridging the execution gap as it gives you direction and helps you stay on track. Not having a plan will have you running amok.
And without a plan, there can be no commitment. How many times have you started a diet on Monday and then given it up the very next day just because your co-worker brought in a box of donuts to work? You didn’t want to offend her so you thought that you would just start over the next day.
Commitment is key to execution and without any you will keep getting derailed from pursuing your goals.