Ron Wolforth's "Combat Pitcher" is one of the best conditioning programs for pitchers on the market. It includes weighted ball drills (and soooo much more) well worth the $.
I use many different parts of the Combat program with my HS team. My pitchers work with 14 oz. Balls, then 7 oz. and finally regular weight. We throw no more than 6 to 8 feet from a net or wall. After the first few drills we use only the 7 oz. And regular weight. 14 can be too heavy when throwing all out.
In general you should have a knowledgeable person help you with a weighted baseball program. Long Toss and develop a solid base before you take this step. In general a 4 - 5 -(6/7) oz balls should be used in conjunction with an overload/underload training regiment.
We use the Combat Pitcher weighted ball system. We just spent 3 weeks using the program with 6 pitchers. We had done the Jaeger long toss program leading up for around 4weeks. We velocity tested all 28 kids in the class prior to this 6 week total program and tested again Monday. 26 of 28 kids made improvement( 2 who didn't were either in ISS or injured for a time.). 24 made at least 2mph improvement. We had 5 gain 5mph..We threw the entire fall so it wasn't like we hadn't picked up a ball. Every arm was already in shape. We will do it for 4 more weeks . Weighted balls Tuesdays and Thursdays. We had no 90mph guys yet this season though we had 3 last year who all went D 1..Hopefully we will have someone hit it. 3 at 87.
Dr. John Bagonzi has some great info, and his book is a great read. Tom House also came out with a book a few years ago where he did a study just using 4oz. baseballs to increase arm speed. It worked. It may be the best thing during the season.
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