I'm hardly an expert dietician nor body builder or trainer but I have been a swim coach and assistant and have always been on a swim team or Master's workout group.  I think the physical proportions that rock the speedo are what comes from such activities, and a lifetime of them, and keeping the weight under control with smart eating and monitoring of changes.  A lot of dryland exercises with or without weights are great for improving this look, for this I very highly recommend a book called "Swimming Anatomy" by Ian Macleod. 
		
	
		
		
		
		
		
	
		
		
	
	
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