Answer:

You can absolutely improve your baseball swing a LOT with the right exercises. You need to work on anti-rotational and power transfer exercises for the core.

A good exercise for the baseball swing can be done with just a dumbbell and a bench.

• - Set a dumbbell on end on the end of a bench then sit down beside it.
  
• - Your legs should be perpendicular to the bench.
  
• - Keeping your upper body vertical and knees pointing straight forward, turn to the side and grasp the dumbbell with both hands.
  
• - Lift it off the bench then rotate to the other side and set it down on the other end of the bench.
  
• - Repeat this from the other side.
  
• - Keep your breath sucked in when doing this one but be sure you don't hold it too long.
• - Use about 20 to 30 pounds to start with on this one.