Dreaming of a large gym and King Kong can symbolize various aspects of your waking life. The gym represents a place of self-improvement, physicality, and perhaps the challenges you face in trying to better yourself. It could also suggest feelings of pressure or the need to perform in some area of your life.

King Kong, being a giant creature, may represent something overwhelming or a significant challenge that you feel is looming over you. This could be a personal issue, a fear, or a situation that feels larger than life. Your instinct to hide indicates a desire to escape or avoid confrontation with this challenge.

Diving into the pool and holding your breath underwater suggests that you are trying to find ways to cope or deal with the pressure. Water often symbolizes emotions, and being underwater may indicate a feeling of being submerged in your feelings or struggles. The ability to breathe underwater could imply that you are finding ways to adapt to or manage your emotions, even in difficult situations.

Overall, this dream may reflect your current emotional state and coping mechanisms regarding challenges in your life. Consider what in your waking life feels overwhelming and how you might confront or manage those feelings. It could be beneficial to explore these challenges rather than hiding from them.