Hitting off the tee is really important. I remember Edgar Martinez saying he would hit 300-350 balls off the tee daily. You should definetly use a tee, and if you can, hit off it everyday.
The tee is the single greatest hitting tool in the game. It gets you back to the basics. Whenever I speak the first thing I ask is how many coaches are golfers. Where do most golfers go to get their swing right? The driving range off of the tee. The same goes for hitters. Repitition, pitches in diferent locations, immediate feedback and cheap. My high school team goes through at least 3 tees a year. Respect the game.
Tee drills are an essential part of hitting. Most major league players (Albert Pujols, Alex Rodriguez, David Ortiz, Manny Ramirez, etc) use a tee a part of their workouts.
It is important to realize tee work is just on part of it though. Soft toss, machine pitch and live BP all have their place in your workouts.
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