"If you don't know where you're going, you'll never get there" -someone (probably)
Goal setting is a popular topic for blogs, life hack articles, etc for a reason, it's an effective method of achievement. The gym is no different, the problem is that most of us aren't properly setting achievable goals.
Several often heard phrases in the gym are "I want to get in shape" or "I want to tone up" or "I want to get stronger". Those all sound great, who wouldn't want those things! Here's the problem, how will you know when you've gotten in shape? Are toned? Strong?
Wouldn't it be much better to say "I want to be able to run two miles without stopping", "I want to fit into my favorite pair of jeans again" or "I want to be able to throw my kid in the pool"? Now you have something specific to aim for, something that is specific to making your life better. Isn't that much more motivating? Goals in the gym can be big or small but they have to be specific, measurable and personal.
So figure out what it is you really want to do and let us know, we'll be your navigation system!