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Without knowing your son's age - I'll post as if he's 14+yrs. and at or near the high school level. The baseball swing is an explosive movement. Fast-twitch muscle fibers firing on all cylinders. Underload principle will help build those fast-twitch muscles. We use a 38" length - 1" PVC pipe to practice the underload swing. 3 sets of 5-6 quick swings in both directions from the right & left-hand side.
More importantly, players need to train their arms, legs & core in explosive movements. DB Cleans, Plyo Push-ups, MB Slams & Rotational Toss, DB Jump Squats, Lateral Skater Jumps, Split Squat Jumps and we use a 6lb. Sledge and hit a large truck tire. That "baseball swing" is the overload principle at work. This movement is mainly used to train the forearms/wrists at impact and to train the muscles related to the core.
Finally, take a look at his swing. Is there room for improvement with his load. If he gets stronger and more explosive, but his load is just so-so, he'll still just be a singles hitter.
Here are a few Stack videos and an old school drill:
Old school ------ Hit a basketball off of a tee.
http://www.stack.com/video/772...anded-hitting-drill/
http://www.stack.com/2012/05/1...c-forearm-exercises/
http://www.stack.com/2012/10/01/bat-speed-drills/
http://www.stack.com/video/905...with-gordon-beckham/
http://www.stack.com/video/776...reebok-vector-o-bat/
Cut a tire in half, nail to a fence, find a old wood bat and take 5 swings thru the tire, don't stop on contact, rest then take 5 more.
Find a rubber racquetball and squeeze daily for finger and hand strength.
Bob
It's the same idea, but the bag may not survive the pounding. Also, if you are hanging it from the rafters you may want to put some reinforcement in the framing to help absorb the stresses.
Underload / overload works. You need three bats. Your game bat (ex = 32/29), game bat +3 oz (32/32), and game bat -3 (32/26). Over time, repetitive swings with each bat will increase bat speed and power (assuming you are mechanically sound).
To increase bat speed in a matter of a few minutes. Thats not possible or is it?
Drill: ONE ARM DRILL
Soft toss, tee's. or machine, whatever. I would start with a tee...
Put the bat in one hand and choke up a little more than usual(left hand, then right hand). in most hitters the weakest hand is the front hand. Do this drill 3 sets of 10 swings then let the hitter use both hands.
You will see immediate results. One of the biggest problems which causes the hitter to have a slow swing is one arm is weaker than the other..Thats the one we are looking for...
Work on this drill and you will see a major improvement quickly.
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Just try it and see if the swing isn't quicker immediately, tell me if I'm wrong. You as a coach and the player will see the results.
The more you practice this drill the quicker the bat will be with both hands.