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		 I'm with Will on the barefoot thing.  I've been working out barefoot for about a year and it hasn't caused me any problems.  Dancers train barefoot and they do a lot of jumping around.  Probably a good idea to have some padding though, I use a tumbling mat.  I don't know that I'd recommend running barefoot on concrete or asphalt. 
		
		
		
		
		
			
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				life is a sexually transmitted disease
			 
		
		
		
		
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