When you choose to commit, you do it for a good reason, whether it be to better yourself or to help someone else. If you decided to do it, stick to it. Don’t give up on what you promised, because that is how you fail yourself. By not attaching you your commitment you are telling yourself you cannot do it when you actually can.
A commitment is all about putting effort into accomplishing or maintaining a goal when you give up on that goal you are giving up on yourself.