Question for Mr. Doyle

If you google "pyramid bat training" or some variations you can find all kinds of stuff. One is here. I have done a simplified version with slightly heavier (1-3oz) and slightly lighter bats with good results. Use a T and hit the ball. I think rubber bands on bats can be troublesome.

http://www.webball.com/cms/page1300.cfm

There's a very fine line with weight bat swings.

Anything 15% heavie ror lighter than a regulation bat WILL change swing mechanics.

So, if you do decide to do over/under training, be sure to stay within those guidelines.

Also, I'd advise against 100 swings. That is way too much and will create mechanical breakdown.

Agreed with BOF, bands are a nightmare and very akward.

I would also suggest hitting a ball for the majority of swings, either soft toss or tee, not live.

Quite often you'll see hitters do so many dry swings that they lose track of the major purpose, which is to hit the baseball!

Keep us posted on your results if you decide to do this.