How much batting/polyfill would be needed for 10 horses?

This takes practice.The more you practice focusing on the fast ball, the better you'll get. Stick with it!

At least 10 feet, and use a white or light-colored surface to project the image for maximum clarity.

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Don't hold your bat so it's pointing toward the other side your shoulder, as this just makes your swing longer. Also, don't point your bat too far behind you; instead,...

Since 250 ml is half of 500 ml, use 37.5 ml of sugar. Just cut the measurements in half.

It would depend - more measurements would be needed to give an exact answer.

I was surprised to use five 60 lb. bags to fill a mini-van's tire. That is 300 lbs! Works great, though.

You should be able to find it in a craft store, or you can order it online from Amazon or another online retailer.

Typical charge is around a dollar for ten balls.

15 feet wide and 50-70 feet long, depending on the use for the cage. For example: a traditional open tunnel is 70 feet long to accommodate pitching lessons. A set...