my wrist is small but i am able to do it for 26 secs before failure but i also been bowling for 9years total + ive always lifted so that prob helped another way to build forum arm muscle is to take a stick with a rope tie a milk jog filled with water and roll the rop up then control it on its way down you may not be able to fill the jog up all the way at first but you will! =D good luck and good bowling
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