Bloating, water weight and sweating

yirara

I havn't really thought through this, so please excuse...

What is bloat exactly? Is it the same water accumulation that some people get in their lower legs and the same as stored after a hard weight session for the muscles to heal?

If I go to the sauna, would I lose water from all three things mentioned above the same way or is it some 'different' water? If water is used for muscles to get better again, would going to the sauna be a problem?

Sauna or a very hot bath or very hot weather that is. I'm asking because I'm trying to understand water gain and because sore muscles seem to last longer after a very hot bath.