"While some doctors run marathons or climb mountains to help deal with what we encounter day-to-day at the hospital, I have taekwondo," Lim said.
The black belt, who trains at the University of WA Claremont campus gym, recently returned from the International Taekwon-Do Federation (ITF) World Championships in Italy.
"Our WA team is used to a competition of about 100 to 150, and the world champs were more than 10 times that," Lim said.
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READ NOW"There were a lot of fresh faces on our team who had never competed at that level before.
"Imagine 2000 people packed into this tiny local tourist village Jesolo, it was amazing."
Lim said the next big challenge was the Taekwon-Do Perth Cup State Championships on August 22 and 23.
"Last week I got back from a training course at the Gold Coast with about 150 black belts from Australia and New Zealand, which was great because the Gold Coast is hosting the next ITF World Cup in 2018," he said.
"I am a little nervous for the state championships because the expectation is much higher than before.
"No matter who you are, you get something out of taekwondo. It is not just a combat sport; it is about learning good manners and avoiding conflict as well as building fitness."