arm strengh

Question
how can you develop arm strengh in kids ages 10-12? are there
any drills or exercises that would help

Answer
Long tossing would be my answer.  Set a specified # of days - 3 or 4 - and play catch, gradually increasing the distance every 3-4 throws.  After a max distance is reached, then work back in using the same approach.  The closer you get - become very target-specific.  Work on accuracy.  If he's a pitcher, you can conclude with 1/2 speed work from the windup working on location and maybe a change up.

Good luck -

Pat