The Richard Bozon Chamonix Sports Centre has a gym (salle de musculation), with a selection of body building and cardio equipment.
There is also a sports hall where you can join in fitness sessions such aerobics, dance, circuit training, step class, stretching and toning classes. They also have children's sports classes and ballet lessons, a bouldering wall, ice rink, sauna, steam room (hammam) and swimming pool.
The indoor pool is 25m long and also features a separate children's pool with bubble jets and a water slide. The is also a 50m outdoor pool open in the summer months.
Unlike many public swimming pools is France, Speedo style swimming trunks are not mandatory for men.
The main sports centre opens at different times of the year. Click on the website link above for current dates, times and entry prices.