One of the top significant reasons why people abandon their New Year's resolution is because they try to do everything at once, as opposed to setting small, realistic, attainable goals for themselves. Trying to do everything at once is when people tend to run into trouble. Some people commence working on their resolutions, but then come to find it's more complicated than they thought it would be.
Then, instead of believing in yourself and pressing forward, you will often stop before any real progress is made. People will struggle with their weight loss goals for this very reason. The best fitness plan is not over the top, and it should cause minimal disruption in your life. The main goal should not add stress. It should be fulfilling and rewarding enough for you to keep going.