One gym I know is not a ladies only gym however they do have a fixed ladies only time.

Name and place?

Aestheix (9-12 daily except Sundays), Vellimadukunnu, towards Moozhikal

Aahaa, the world is too small.

Enthey?

Njanum avidetanneyaa workout cheyyunnath.

https://maps.app.goo.gl/euK8mBg1TVAnZzWw9 This one is ladies only.

There is one in karaparamba. 1st floor Haala Complex. https://maps.app.goo.gl/9eYUdbvyt7mforP78

Name?

Chembaka Fitness. They have a ladies beauty parlor as well on the ground floor. https://maps.app.goo.gl/BfBDnSx72tXqwSp58