Symbolic of strengthening the spirit through prayer and reading the Bible.
A gym may also symbolize bodily exercise, 1 Tim. 4:8
Place of training for the competitive game of life; see “game”
In dreams, from a spiritual perspective the gym is a place where we face ourselves and our own foibles; its original meaning was a place where one trained naked. Today this can be translated as hard work with honest effort.
Psychological / emotional perspective: The gym is an environment where emotions can become raw and we are able to work out our problems, both from a physical perspective and from many others. In dreams, it will therefore represent a safe space, but also one of focused power.
Material aspects: In dreams the gym represents a place that is not work-oriented and yet requires effort, so may identify what needs to be tackled from a social perspective. These need not be problems, but perhaps a structured series of actions that can enhance our lives.
Need to strengthen.
Do more for and with your body.
Dreams of a gym represent that you are growing, strengthening, and improving your body, mind and spirit. You are getting stronger as you work out the details of your life. Or this may be a literal message for you to get the gym. You are engaging in -discipline and raising the bar of your energy level.