Gymnasium 
To dream that you are in a gymnasium implies that you should use your experience and knowledge to assist you with making decisions and setting objectives.
Arena
An arena is a place typically used for theatrics or feats with an audience, so this dream means that you need to be in an environment where you can freely express yourself, or that you need a stage or platform for your self-expression. Alternatively, it may be warning you that there is some issue or problem that needs to be revealed to people around you.
Locker
To dream of a locker suggests that there are things about you that no other people know about. Consider and take note of items that can be found inside the locker. For example, to dream of a school locker signify hidden feelings and thirst for knowledge.
To dream that you cannot open a locker or that you forgot the combination means that you are hesitant to take a stand in situations in which you are unsure about the outcome. In dreams where you cannot find your locker, this symbolizes your insecurities.
Locker Room
To dream that you are in a locker room denotes that you need time alone for relaxation and contemplation. It also means that you are in the process of experiencing some rough times in your waking life. It may also be that you are pursuing a love interest.
Weightlifter
To be a weightlifter in a dream is to be a powerful self-confident person.
To meet a weightlifter in a dream is to meet someone who has a lot of self-confidence. This person may be there to teach you to gain that power.
Weightlifting
To be weightlifting in a dream symbolizes discipline and training. You are working to increase your worth, your strength, and your confidence.
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