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How to curve a bowling ball
Start with the right stance and grip.
You want to be several inches from the foul line and preferably at least four steps away from your release. Some people take longer and that's fine--but at least four steps is ideal.
Line your feet up with the arrow on the lane you are aiming for (which will depend on how hefty your curve is). If you have your own ball, you probably know how to grip it.