As a PGA golf instructor, I always recommend drills and exercises for my students to perform at home, away from the ball. Working on your swing mechanics at home can be the most effective form of practice for fixing your swing motion. Students who commit to correct home practice tend to change their swing faster and have long lasting change.

In order to learn a motion, or motor skill, we must perform a certain number of correct repetitions. When you work on your swing at home, and away from the ball, you focus 100% on the motion instead of the shot. The more correct repetitions you perform, the faster you will learn the motion, and commit it to habit.

Let me use an example to help explain. Let's say that student "a" is working on their back swing pivot. They are trying to turn their left shoulder behind the ball instead of making a reverse pivot. They go to the driving range and hit 100 balls. Out of that 100 balls, how many correct back swings would they perform? From my experience, at the beginning of the learning process, they would make less than 20% of their swings correctly. So let's say they made 20 correct back swings. Well that means that they made 80 incorrect back swings. So my question is which one did they get better at performing? They answer is they got better at the incorrect swing.  

Now, let's take the same student and have them work on their back swing pivot at home and in front of a mirror. They will perform 100 back swing pivot drills looking in the mirror. How many of the 100 repetitions will they perform correctly? The answer should be 100, because they are watching themselves. This type of practice is the fastest way to learn a motor skill. Once the skill is learned then it is very easy to apply it to the ball.  

Their are many practice aids for use at home. The most important one for me is a mirror . You can work on all parts of your game in front of a mirror. The PowerChute  and Orange Whip  are very effective swing training aids that can be used at home. A heavy ball or heavy club can also be effective if used correctly. I also like the GolfGym Power Swing Trainer  for home use. It not only helps with swing mechanics, but also on your fitness. The point here is to dedicate a portion of your practice time to home. Focus on your motion and build a sound swing.