So basically I have a 6 day workout program.  3 days I lift weights and the other 3 days i do some sort of cardio.  2 of the 3 cardio days I do distance running (>6 miles).  On the other day I can't decide between doing sprints (100m and 200m) or swimming laps.  My overall goals are to tone up, get a 6-pack, and build muscle.  Which workout would be better in terms of my goals?  Maybe I should do swimming one week and sprints the next?  Any advice is appreciated, thanks!
				
			