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just to add to what 5k has said, dehydration can be a big problem, before tryouts and games you need to be fully hydrated beforehand. drinking 1-2 litres of water around 2 hours beforehand or the night before if it is an early game. keep fluids up at any oportunity you have. during half time especially if it is hot wrapping a cold towel (or a damp towel that has been frozen) around your body will help conserve energy for the second half as your body won't need to use energy to cool itself.
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