Yes, it just makes you sweat more... But little (if anything else).
Personally? I think that unless you have a weigh in they are a waste of time and pitentially dangerous.
I'd rather spend energy in my workout on throwing more, harder, faster punches than spend extra, uneeded energy on regulating temperature and sweating.
If you're fit, well hydrated and eating well you should get a good sweat on any way and your body mostly removes waste products best through circulation of the blood and lymphatic system. Both of these processes happen best by exercising... Sweat is secondary and your lymphatic system won't work as well dehydrated. So the toxin thing is a bit of a myth really.
Plus if you sweat in a t shirt a lot of it is wicked away... Sweat in a sauna suit and is goes no where till you take it off... So you'll reabsorb most of the toxins via osmosis anyway.
You're going to be losing a lot of pottasium and soduim in your sweat too. You're more likely to suffer muscle cramps and your recovery and contraction force and speed will suffer if you are low on these minerals. Not goid for your nerves.
Recently did a 24 hour boxing circuit for charity. I walked in 13 stone 2 and walked out 12 stone 4... Less than 24 hours later I wad 12 stone 12.
I spent the week before eating tonnes of salt/pottasium rich foods so I didnt make myself ill!
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