The eminent Muslim scholar and renowned Da`iyah, Sheikh `Abdel Khaliq Hasan Ash-Shareef, states: “It is permissible to open a fitness club for women only under the following conditions. 1. It should be for women only; I mean all workers in it should be women, i.e. no men should work in the same place. 2. The major `awrah (private parts of the body that should be covered) of women should never be displayed. 3. The minor `awrah (between the navel and knees) should be also covered and covering more than these parts is something preferable and commendable.
So, we should be keen to observe the above-mentioned conditions.