Exercise clothing is designed for a range of motion that cotton or other natural fibers can’t always provide, on top of what everybody else has said.
I can’t comfortably squat in cotton pants, but I can in workout pants/leggings. It doesn’t bunch up or move around when you don’t want it to, either. You don’t have to constantly adjust when running if you wear clothing designed to do that.
As for the musty smell, usually an enzymatic detergent will do the trick. Old school tide powder and a couple tablespoons of vinegar in the wash gets rid of all but the funkiest of funks.
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