We use this. Softball.com
It has actually helped with casting and speed and can be used to get multiple swings quickly, indoors. I like the pro glider as the ball comes off. One of the keys to a high level swing is cap to pitcher. I think that would really help. Coach Lisle recommends it.
The momentus is what my girls hitting coach recommends and his kid uses. Of course his 10K lessons, college coaching, high school coaching and is a full time professional hitting and pitching coach doesnt know what he is talking about though.
How many swings a day do you recommend? I prefer live pitching of course but we can use this where she weight trains, but no front toss.I LOVE the ProGlider. Best tool out there for hitting. Having said that, I don't get a dime for promoting it or anything. If I had the ability to buy the owner out, I would.
It teaches so many things that it probably wasn't intended to do.
1) Working slow to fast. If you swing too fast too early balls shoots to 1B foul ball side
2) Helps you maintain the front elbow L. If you lose the L and arm bar..ball shoots to 1B
3) Works on shoulder tilt with flight of ball
4) So many other things.
The flight of the ball tells you everything thats going on with your hand path.
I hate that I didn't invent it or profit from it. haha.