Rabbis oppose gyms and fitness centers
According to the letter, the existence of gyms and fitness centers in Jerusalem is a spiritual and educational problem. It would be one thing if they were just there for the secular public, but some advertise as an appropriate atmosphere for the Haredi community.
These gyms have television screens to watch while working out, and there is inappropriate (at best!) music playing in the background, along with general issues of tzniyus.