With the mention of the gym, what comes to mind is the strenuous exercise that you do there. A friend was complaining of breathing difficulty when he was lifting weights. That scared me because I know of a certain Mr. Ong who owned a gym. He was doing heavy gym exercises every day. Within a year of having the gym, he expired due to heart attack. My advice to gym goers is to be aware of the potential problem with the heart. Don't die in the gym, be considerate of your body alarms.