Whatever commitment that you have made, make it compelling and do your best to deliver on it. If it is not compelling enough, you need to make it so. It is not about trying to over promise thereby shooting yourself in the foot for not being able to deliver on it, but rather it is suppose to excite and push you to get on with whatever it is and actually then deliver on that commitment.
A weak commitment does two things – it does not interest the person you have made the said commitment to and it makes you put it into the back of your mind because of it’s seemingly trivial sense.
So give this some thought. Make your commitment compelling, special, and then do your best to deliver on it.