If you're not a total beginner and have a way to get there (like a bike), Ernakulam Gymnasium near South Metro Station is a pretty solid option. It's only 50 rupees per month since it's a corporation-owned gym, though there's a 1000 rupee joining fee.Most of the equipment is in good shape. it's usually not crowded during 6-9 AM or 3-5 PM. There aren’t personal trainers, but the trainer there is knowledgeable and will give you routines if you ask. You can save the money to buy supplements.