Sports: Swimming vs Hockey?

Everything is compared to football or gymnastics. I've seen so many shirts that say, "If gymnastics was any easier they would call it football". But what about COMPETITIVE swimming and hockey? Two hard-core sports that take a lot of strength, but only one can be more challenging, demanding, and a better work-out. So which is it? Swimming or Hockey? (and where does soccer fit in to the mix?!)
 
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