I have clothes that I keep out of the dryer, but I’m willing to put pretty much anything in the washing machine (aside from dry clean only stuff). I will hand wash my workout clothes, mainly in the summer, when they are drenched in sweat and I don’t have enough dirty laundry to make it worth putting them in the laundry right away. I just put a little splash of laundry detergent in the sink with some cold water to wash them, then hang them to dry. But I do that to keep them from getting stinky, not to prolong the life of the clothes.