For casual bowlers, the most popular weight is 8 lbs. for women and 12 lbs. for men. This is in part due to the fact that house balls rarely fit like a glove, forcing the bowler to clench the ball slightly in order to hold onto it during the swing.
League and professional bowlers prefer a heavier ball, because it packs a greater wallop when it strikes the pins. And a properly-fitted ball actually feels lighter, since muscle power isn't being wasted by gripping the ball.
While many men still use a 16 lb. ball (the heaviest available), a number of pros and league bowlers prefer 15 lbs., which increases accuracy and ball speed without sacrificing hitting power (thanks to today's high-tech ball surfaces, which cut through the oil and generate a tremendous hook). For the same reason, most female pros and serious amateurs use either a 14 or 15 lb. ball.
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Whatever weight feels comfortable. You might try a few deliveries with a 10 pound ball and an 8 pound ball to see what feels best. Also, very important is the fit of the finger holes and span of the finger holes to the thumb hole. Ensure that the holes are not too small/large and the span feels comfortable. One method of determining the correct span is to put your thumb in the thumb hole and lay your middle and ring fingers over the respective holes. The knuckle of both fingers should lay in the middle of the holes.
sometimes it depends on what size he is and how strong he is. but my little brother bowls with a 10 ball and he is 14