I started bowling last fall and I have a weak arm and wrist, too.  I'm using a 15 lb (like my ball) dumbbell and I  always bowl a few games after I get tired just to build up strength and endurance.  Bowling 5-10 games on Saturday (unlimited games for $8 

) makes my 3 games on Tuesday night league easy.  My advice would simply be to bowl more.  When I start to get tired, I bowl another 2 or 3 games.  My scores are usually lower (or really high - go figure 

) in those last games, but it has helped my arm strength a lot.  
To you more experienced bowlers, 
please tell me if this is not a good idea.  I'd hate to be giving bad advice.
 
			
		
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