If you have Poser 9/PP2012, you could also look at constraint channels.

Quote -For our animators that have been looking for a way to animate a ball being throw or caught, we've introduced Constraint Channels and Objects. Basically, the Constraint is an animatable handle for an object that will allow you to parent it to a figure's hand as it winds up for the throw, and then have the object leave the hand and fly through the air as if it's being thrown. Constraints are a simple to use feature that will permit all kinds of cool animation effects.

Here's a youtube video for it:

https://www.youtube.com/watch?v=QNjWK9SO9c4

~Shane