In today's world of bowling it would have to be a "specialty" ball that is just for warming up. It will have a special asymmetric core great for use by "todays" bowlers on "today's" tough warm up routines. It will be another seperate ball to help complete your bowling arsenal.
Just think of the "accessories" you could sell.
Maybe a special bag to carry it in.
A cleaner designed specifically for a warm-up ball.
And a polish...
Oooo, ooo, and a special glove.
Of course it would have to be available in multiple color options, and there would be folks who would need to "collect the entire set!".