* Measurable - The goal needs to have a specific, quantifiable result or else it ends up just as "wishing." For instance, it is not measurable to say you want to be healthier or feel fitter.
However, it is measurable to say you want to be fit enough to swim 20 lengths of the swimming pool.
* Achievable - If you set goals which are too far out of reach, you probably will not commit to doing them for long. Although you may start with the best of intentions, the knowledge that it is too much for you means you subconscious will keep reminding you of this fact and will stop you from even giving it your best.
A goal needs to stretch you slightly so you feel you can do it and it will need a real commitment from you. For instance, if you aim to lose 20 lbs. in one week, we all know that is not achievable. Nevertheless, setting a goal to lose 1 lb. and when you have achieved that, aiming to lose a further 1 lb. will keep it achievable for you.
The feeling of success, which this brings, helps you to remain motivated.