One of the fastest ways to increase your team's batting average and power is to improve bat speed.

The quicker the bat head moves through the hitting zone, the longer your players can wait and see the
ball - and make a better choice in a swing, no-swing situation.

And when your players strike the ball with more velocity, it travels further and faster, increasing
the chances of extra base hits.

Here are 2 simple tips you can use with players of any age to develop lightning-quick bat speed.

Train The Core
A powerful core helps your athletes transfer speed and momentum to the upper body, the arms, and eventually the bat head.

Here are 3 core exercises you should include in your your team's in-season and off-season program:

Plank
Lie down on your stomach. Lift your body off the floor with your forearms (elbows at 90° degrees) and your toes. Keep your body in a straight position (without arching your back) and hold for 30 seconds to one minute. Lift one foot in the air for added difficulty.

Lying glute pushup
The lying glute pushup targets your butt and back muscles. Lie on your back with your feet resting on top of a chair or bench. Push through your heels to raise your butt off the floor as high as possible. Form a straight line from your knees to your shoulders.
Hold this position for 60 seconds.

Twisting crunch
This is one of the most effective crunch workouts, as it hits all of your stomach muscle fibers at once. Assume a standard crunch position, raise your torso to a 45° angle, and then twist from side to side. For an advanced movement, extend your legs and pretend to peddle a bicycle while you continue to twist.
 

Build Grip Strength
To develop a quick bat your kids must have strong hands, wrists and forearms.

Your players can easily build grip strength by using common objects found at home.  Have them spend 30 minutes a day squeezing a tennis ball (they can do this while watching TV or reading).

Another great at-home tool is the wrist-roller.
Making one is easy. Just take a broom stick and cut it to about 12 inches long. now drill a hole in the middle of the cut broom stick and insert a piece of rope around 4-5 feet long.

Now tie one end of the rope to the handle and the other end to a brick or 5lb weight.

To perform the exercise, twist and turn both wrists in an alternating fashion, rolling the weight all the way to the top.  Lower slowly and repeat.