What sort of swimsuit should I wear for a fitness swimming class?

I am taking a fitness swimming class at my high school next semester. I talked to some of the other guys taking the class, and none of us are quite sure what type of swimsuit to wear. Would it be better to wear trunks, a jammer, or a speedo?FYI, I’m a guy and the class is for fitness, not for learning how to swim.

What sort of swimsuit should I wear for a fitness swimming class?

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