"Golf swing information shouldn't be based on opinion, only fact!"
#1 Lead Leg Only Drill - Put your feet together, stand on your lead lead get with your heel down and move your trail leg behind you with your only your toe touching the ground, try to swing back and through in balance first at half speed and then progressively harder.
What it's for and why it works: It's for people who cannot find the bottom of the club arc. It is also for people who are too "Trail sided when swinging" It keeps the player from having too much negative or positive spine tilt on the backswing and downswing and forces you to have a neutral spine angle (that's if you're keeping your balance). It also prevents you from spinning out in your swing and also helps you steepen your shoulder plane on the backswing. You'll find that you'll hit shots surprisingly more consistently swinging on your lead leg because you're consistently reaching the same low-point in your downswing.
#2 Ball Forward Drill - Place your golf ball more forward of stance (toward the target) outside your lead leg. You should feel like you may miss the ball through impact. Can you hit the ball pure and straight? You should be able to, if not, you're early extending.
What it's for and why it Works: This drill is for casters of the golf club, early extenders and people who hit it off the toe. It forces the golfer not to swing from the top. It also helps golfer to create more vertical ground force through impact. Try this drill and videotape yourself down the line. If you're doing it right you will see yourself keeping your spine angle and tush line more better and not early extending. It helps with the toe shot.
#3 Split hand drill/Hockey drill - Simply split your hands on the golf club about a few inches apart. Can you hit the ball in this manner? You should be able to.
Who it's for and why it works - This drill if for people who flip at the golf club and are too handsy in the swing. It focuses your attention more on what the writsts-arms-torso relationship should be. It works because you won't be able to hit the ball if you are simple flipping your wrists at the ball.
#4 Club Pump drill - This is one of my favorites btw. Take your address position, swing the club back with your arms and shoulders to about waist high making sure you're looking at the ball, and your clubhead is pointed more at the ground, pause for a second, swing the club up in the air by raising your arms in the air and turning your shoulders more and then make your swing. Actually hit balls like this.
Who it's for and why it works - This drill is for players who are looking to get the right feels of shallowing the club correctly. Remember, shallowing the club happens because of the steepening of the hands on the downswing. I repeat, the shallowing of the club happens because the steepening of the hands in the downswing. Too many players swing the club out toward the ball thinking that will create a shallow path, but this is incorrect!!
#5 The Step Drill - Start with your feet together. Make your swing simultaneously as you step with your lead leg. Try to feel like you're falling toward your lead leg. Try to feel your lead side fall as you swing the club in the air. It should almost feel like a baseball swing except you start wit your feet together and and the club on the ground. Can you hit shots like this? You should be able to.
Who it's for and why it works - It's for people who need more distance. It's for people who over-swing and and obsessed with their backswing when in reality they need to work on their transition. It's for people who have too much of a level hip condition on the backswing when in fact there needs to be and downward tilting of the lead hip. This drill is also really great for people who struggle with rhythm in their swing.