A good goal includes accountability and often consequences.

While there are some people who are so disciplined that they do not need anyone to be accountable to except themselves, those people are few. It is best to have someone or a group to report to on a regular basis. Sometimes it is important to have a consequence. Many years ago I had a professor who helped people with smoking cessation. (His plan for accountability and consequences required both an honest and a determined client.) He and his client would make a plan. His client would give him ten checks. Each one would be written out to an organization that the client detested. If the client stuck with the plan each week, one check would be torn up in front of the client. If the client did not meet his or her objective for that week, my professor would mail the check to the organization. Today, I believe I would want to put something like this into practice with cash and would have a tendency to want to be able to verify the outcomes; however, the principle is the same.
There are as many options to accountability and consequences as imagination will allow.