Most cities had at least one bath complex. Pompeii itself had three bath complexes.
Baths were not only used for hygiene, but for socializing and entertainment. Romans would stay for several hours exercising, meeting friends, reading, etc.
Baths were for everyone, even slaves. Fees were sometimes charged--small enough to accommodate everyone. Baths would be open to women in the morning and men in the afternoon, or women would have a separate complex.
Bath Steps: change in the apodyterium --> exercise in the palaestra --> visit hot room (caldarium) where you cleanse with oil and strigil --> visit warm room (tepidarium) --> visit cold room (frigidarium)
The apodyterium was the changing room, where there were many shelves to place clothing in. Slaves would guard the clothing against thieves.
The palaestra was the exercise area, where athletes wrestled, ran, lifted weights, and played ball games.
The caldarium was the hot room, as it was close to the furnaces. It included a hot bath and a basin of cool water to wash your face. The room was in a tunnel shape to allow steam to roll off the sides rather than straight down towards the bather
The tepidarium was the warm room, or the main room of the bathing process. It was a place for relaxation and usually incredibly decorated
The frigidarium was the coldest room, furthest away from the furnaces. It included a plunge bath or swimming pool. People would often not spend much time here.
Olive oil was rubbed on skin to separate it with the dirt. Romans then used a strigil to scrape the oil and dirt off