I like SMART goals, Specific, Measurable, Attainable, Realistic and Time-sensitive
I like to set long term big picture goals, but also weekly and monthly goals so that you can feel a sense of accomplishment as you achieve each mini goal. I also like to focus on what you can control. Setting weekly targets for minutes/miles of cardio, sessions strength training, adherence to nutritional plans. I don’t like to focus on the scale as a goal, since there can be fluctuations in weight that are unrelated to effort (water retention for example) and that can lead to disappointment