Kickboxing

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I just signed up for some kickboxing classes. I've taken some martial arts in the past, yoga etc but have never done actual kickboxing. I was wondering if anyone can offer some tips. I assume hydrate a lot which I usually drink around 80 oz a day but I was confused as it said online to eat carbs before going. Is this normal? I know it burns a high level of calories but shouldn't I eat protein rather than carbs?

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