Gym in a dream can be an indication that we need to develop with effort and discipline, a part of ourselves. Not necessarily it has to be referred to the physical aspect, but some part of our personality, emotions, mind, or spiritual realm.

…(Injury | Wounds) In a dream, a scratch represents financial harm. If one sees another person scratching him in a dream, it means that he will cause him partial financial loss, or pain with respect to a family member, or perhaps he will accuse him of something, then compensate him for injuring his reputation. If the scratch gets infected, bleeds, or produces pus or purulence in the dream, it means that the assailant will slander him and cause a major collapse to his business. If the scratch is over one’s forehead in the dream, it means that he may die quickly. A scratch in a dream also represents a bad reputation, an acronym, or a nickname such as stingy, insolent, or apostate, etcetera. A scratch in a dream also means recanting one’s statement. (Also see Scratching)…

If the color red dominates in our dream, we should interpret it as a synonym of action, but we must consider that this action may result in love or hate, conquest or dedication. This color for some scholars signifies violence but for others it means that it’s about dynamic and adventure. It’s also considered the color of passion, and depending on the context of the dream, it can have a sexual background.

In dreams faculties provided by gymnastics are applied to the personality, the body, the spirit, the mind and the emotions. To dream about practicing gymnastics is a sign of long, healthy and pleasant life as long as we keep our body, mind and spirit fit. If we dream of a gym, it is an invitation in the same direction.

…Dreaming that the environment is dark warns you about a possible fraud at work. Darkness is a synonym for ignorance, evil, death and fear of unknown things. If in a dream, the sun appears in the dark it means you will overcome your failures. If in a dream you feel confident in the dark, it indicates that you prefer not to know anything about certain things. If in a dream you’re looking for someone in the dark, it indicates that in real life you must control your temper, you have a tendency to lose your control. Dreaming that you’re lost in the dark means that you’re depressed or insecure….

When you dream of working out on aerobics it symbolizes that you need to start exercising. Maybe you should start going to gym, running or hiking. Make sure you find type of sport you would like to practice.

Dreaming about this cardinal point is a synonym for success, overcoming obstacles and glory. The dream predicts that we’ll achieve our goals in all the activities we’re carrying out and in those we start in the future.