A large indoor space where you may play, work out, or be a spectator may help you evaluate your skills and performance in fulfilling your goals As a spectator, you may have an opportunity to critique your style and abilities. As a player, you reenact and leam from events of your waking life that required a team effort as well as individual skill. (See Health cInk)
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.
To dream that you are in a gymnasium suggests you need to apply things that you have recently learned in a situation, into the rest of your daily life.