Surprisingly enough, the official answer is dance. In the majority of sports, you're given frequent rest periods (I.E. waiting for the ball in soccer, between downs in football) but in dance you're at it nearly the whole time.
If you do not consider dancing as a sport, then squash is the most tiring. There is very little time to rest and there is a lot of running
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Olympic athletetes claim that it is the Decathlon which is a series of ten different Track and Field events held over a two day period. It is difficult because it requires training and skill in throwing events like the Shot Put, Discuss and Javelin, four different running events as well as the Long Jump, High Jump and the Pole Vault. The basic requirements are for a good all around athlete.
A good one is Water Polo. It's tiring enough treading water for a half and hour without playing against an opponent. Add in blocking, leaping in water, out-swimming your opponent to get to the goal, and you've got tiredness to the max.
Well no sport is easy but I play football and I will tell you this, it's not as easy as it looks.
No...Waterpolo is the most exhausting sport. You have to work just to breathe, let alone play the game.