Kru Petchdam Yokkao or more popularly known as Kru Jack is one of the primary trainers in the YOKKAO Team. Kru Jack has the distinction of being Singdam’s trainer, among other fantastic Nak Muays. Students will learn the tremendous techniques that Kru Kack imparted to Singdam and other top fighters to become great Muay Thai champions. They are sure to benefit from the wealth of skills and knowledge that Kru Jack will be able to impact to them through the course. He has been a fixture of past YOKKAO Seminars, sharing and teaching Muay Thai to participants in various locations. In the recently concluded YOKKAO Muay Thai Seminar in the US, led by Saenchai and Superlek, Kru Jack was supposed to accompany the team. Unfortunately, an injury prevented Kru Jack from being part of the tour. Kru Fasai went the YOKKAO team to the US instead.