Anonymous wrote:OP here - just checked back for the first time. Woah everyone, dh does not re-wear dirty, smelly workout clothes - I never said otherwise. He wears clean workout clothes every time he exercises, so please no insults about him at the gym

He hangs his dirty workout clothes to dry because they are soaked with his sweat when he is done exercising, and it isn't always practical to wash them immediately after working out.
For example, if he works out at home in the morning, he could throw the clothes into the washer but not hang around to get them into the dryer, which causes its own set of issues to leave wet clothes in the washer all day, so usually in that situation he'll hang his wet (smelly!) workout clothes on hangers to dry out and then wash the clothes that night when he gets home.
Sometimes he hits the gym on his way into work in the mornings and then his wet (smelly!) clothes will sit in a big ziplock bag in his gym bag in his car trunk all day - if he has stuff to do after work and doesn't get home until late, it isn't always top of his to-do list to wash his gym clothes but he will always hang them to dry out at least.
I also am troubled from a water usage standpoint about running the washing machine 6 days a week for his workout clothes alone - that seems a huge waste of water.
I am going to mention the above suggestions of the different material of work out clothes and see if that makes a difference (seems a good father's day gift).
But to clarify one more time, in any of these cases, he doesn't re-wear the dirty clothes the next day - he has more than one pair of gym shorts and t-shirt ...