Their not ramrod straight up and down, they do have some forward tilt. (It's around 15°)
It use to be they wanted bowlers to be ramrod straight up and down. Because they were wanting to put lift (hit up) on the ball, To get the ball to hook. So they didn't use a lot if any forward tilt.
With the modern bowling balls and lane conditions, you don't want to be lifting (hitting up) on the ball because it can create inconsistent ball reactions. So you use more forward tilt to help keep from lifting on the ball, plus it helps to project the ball down the lane.
Earl Anthony used what used to be called early timing (Now called roll timing) and the forward tilt helped with that.
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