I run almost every day and I don’t stink… oh wait, maybe I do? Oh no! Is that why my wife does laundry every day?
There was an article in my paper this morning (with a Washington Post byline so probably a wire story) on this. It said problem one is the wet clothes aren’t aired out but left in the gym bag or hamper, so take the wet/sweaty clothes out and air them asap. Second problem is the most work out clothes are made of synthetics which are usually washed in cold water and there is some sweat chemical/waxy thing that requires hot water to melt so waxy thing keeps building up. Said you have to use a special soap (HEX?) and that Tide sports works.
I heard the same thing about using a “sports” detergent on the synthetic work out clothes and started buying Tide Sports. It worked.
Huh. Who knew. I’ll try it.
Our master bath is large enough for a wicker hamper with lid as well as a small open basket (usually for underwear).
However I hang the running clothes on hooks behind the door in DS’s old room for airing-out and rewear another time. If ready for a cleaning, I throw in the washer and run a load with other accumulated laundry and/or towels.
@abasket - our problem is indeed that the laundry room is on the main floor - and is next to the guest 1/2 bath on this floor.
I know I can’t get H to wash his stuff every day. Will see if I can get him to hang his stuff out in the sun room to dry first. Will also look at getting Tide Sports. And get a wicker hamper for our room.
My husband’s morning gym clothes are in his car all day baking in the Florida sun. He empties him gym bag into a laundry basket in the garage every evening and then on Saturday I wash it all ( on the sanitize setting!)
Perhaps a shower or bath shortly * before * exercise may reduce the smell, by washing off a day’s accumulation of apocrine sweat / sebum / bacteria, so that the eccrine sweat produced during exercise has less smelly stuff to bring out and less bacteria and bacteria food to cultivate.
https://www.washingtonpost.com/lifestyle/home/this-is-why-your-workout-clothes-still-stink-after-being-washed/2019/03/04/543c5a94-39ed-11e9-a2cd-307b06d0257b_story.html on this very topic appeared recently.
https://www.amazon.com/Defunkify-ACTIVE-WASH-Laundry-Detergent/dp/B06Y3ZJKTS
You are very welcome. 
My co worker exercises at lunchtime to the point where her exercise clothes are soaked. She hangs them on a rack in the shower of our office. They don’t smell since it gives them an opportunity to partially dry plus she takes them home at the end of the day. I know she uses a special detergent for her workout wear. When she used regular laundry soap she said even though the clothes smelled clean when she put them on as soon as she started to exercise she could smell them.
I hang my stuff over the edge of an open hamper and that helps dry them out.
My H plays volleyball in board shorts. He will also often take a swim in the ocean afterward. If he leaves his shorts and towel in his car for several days it stinks. A lot of the time with the combination of sweat and salt water the stuff doesn’t dry and if left in a pile will mold. What I prefer him to do is lay his shorts out on top of our extra car in the garage and bring them in on the day I do laundry. His tennis shorts I’ve tried to stress that he hang them over the side of the hamper but that doesn’t always happen.
The image of all these exercise clothes hanging or laying out in odd places is making me LOL!!! 
I avoid exercise, so I don’t have sweaty workout clothes
DH exercises at his office gym, where he puts his gear in a net bag and they wash and dry it for him, and return it to his locker
I forgot to mention, I typically exercise in a cotton tshirt, which will smell like me, good or bad. But when I (rarely) exercise in a synthetic top, even a Nike drifit, it stinks.
We used to wash “gym clothes” with dishwashing liquid. That worked really well.