Idle Gym City is an arcade-style game in which you manage a fitness gym in a small town. You start with very little equipment, but over time, you can grow your gym with many different locations and equipment. The game is very simple to play and requires minimal attention. However, the more equipment you have, the more complex the gameplay becomes.

There are many different items you can use to manage your gym. The first is the equipment itself, such as exercise machines and weights. The second is the environment you manage, such as a rooftop, beach, stadium, yoga studio, and aquapark. The third is the customers, who are your main source of income. The fourth is the level of complexity, which increases as you progress.