I see all sorts of dodgy outfits in the gym, indecent 80s running shorts, midriff baring crop tops, all sorts of lurid dayglo colours. Lately guys seem to be a lot more into their lycra - I think it's all the cycling.
What I don't normally see is gym kit with massive holes in it, and by massive I mean 10 cm squared, but today I saw just that. Anyone who can afford to go to a gym in the city can surely afford a new tee shirt for the gym.
They can also afford to have enough kit to wash it every time they wear it. By not doing so the salts excreted in sweat have time to corrode the material - hence the holes ... grim.
It's not just salts that you excrete through your skin. Your skin is your second excretory organ (after the liver) and so is used to excrete toxins too.
This explains why after a particularly heavy night you can feel (and sometimes even smell) the alcohol coming out of your skin. This is also why eating a high toxin diet can bring you out in spots .
It's worth noting that your skin isn't a one way street - you can also absorb toxins through it as well. This is why it's a good idea to have a good shower straight after the gym or sauna and when you wake up in the morning, as you detoxify overnight so will have excreted toxins in your sweat as you sleep.
To be honest most people know when to wash ... Just apparently not everyone!