I can write all day about just how misunderstood baseball training information is these days. However, I would make myself sick because it really upsets me to see kids getting such bad advice.
One such piece of advice is the use of machines in weight training.
Machines should never be used. I repeat, machines should never be used!
Do you have a machine guiding you on the baseball diamond? I didn't think so. So why in the world would you train with them?
Machines are not only useless, they can decrease performance and increase the risk of injury! That's right. Triple whammy right there.
On most machines you are sitting or lying down. In order to increase power, strength and speed your must perform ground-based movements. This means your feet are on the ground and you are standing up. Not sitting on some pretty chrome machine.
Machine strength has very little carryover to the baseball diamond for a number of reasons. The machines actually guide the weight for you. So the stabilizer muscles do not have to work. These may be one of the reasons for the high amount of injury our youth have been experiencing.
Please do yourself a favor and use good old fashioned barbells, dumbbells, medicine balls, bodyweight movements and kettlebells. Your body (and statistics) will thank you!