Hitters can be grouped into two buckets, linear and rotational.
The linear hitters can be great hall of fame caliber players (for example Ichiro is a linear hitter).
There is absolutely nothing wrong with the way Ichiro hits. In fact, linear hitting is a great way to produce a lot of singles and a high batting average. Most lead off hitters, as well as your 7, 8, 9 hitters will be linear hitters.
Linear hitting is great for players that can run like the wind, but for the rest of us, and for your heart of the order players, you may need to think about teaching rotational mechanics that generate long gap shots and extra base hits.
The biggest concern in teaching linear mechanics to young players is what happens when these players grow up and do not have the characteristics of a linear hitter (great speed, lots of good contact). There are not many places in baseball for a slow right handed hitter who hits balls on the ground. But a young hitter who is taught rotational mechanics can easily be used as a lead off type of hitter by just putting the hitter more on his axis rather than behind his axis.
Lets take a look at some of the key rotational hitting mechanics of the most powerful swings in baseball over the years. Notice how these guys use rotational hitting mechanics.
Do you use video and computer analysis in the teaching process?
Is the instruction done in a group or individual?
What are the 3 or 4 simple core concepts that you teach?
Is there a difference between style and technique?
Where does the power in the swing come from?