Consider a Trainer
When the transmission goes out on your car, you see a mechanic. If you're sick, you see a doctor. Want to get in top shape? You guessed it, you visit a personal trainer. It's not a sign of ignorance or weakness. It's a recognition of who is the most knowledgeable when it comes to reaching fitness goals.
If you're primarily a runner, a personal trainer can teach you resistance training techniques that will help you lift your knees for a more efficient stride. If you mostly pump iron, your trainer can teach you exercises to keep you flexible. He or she can also provide valuable insights on nutrition.
The costs associated with hiring a personal trainer can vary greatly but keep in mind that some gyms provide the services of a trainer in the cost of your membership. If cost is still an obstacle, consider putting some money aside and giving yourself a month's worth of sessions for your birthday. Once you've run out of sessions, you can continue using what you've learned on your own.
Does exercise have to be hard work? Next, how to make your workout fun.