Longththrow vs short or both

What are the plus or. Negative for 9 year old pitching

The plus is it’s of course fun. The negative is most parents and coaches put emphasis on winning and it should be development Nd positive reinforcement instead.

Long and short throw are both positives for a 9yo as they have not yet specialized in particular positions that dictate long or short distances should be emphasized.

I see ‘working on spins’ in a long toss program. What exactly does that mean? Thanks.

Probably getting the correct backspin on the ball.