In 1972, he founded the Chakuriki Gym in Amsterdam, originally teaching his own style named “Chakuriki”, a mixture of techniques from Kyokushin karate (in which he holds a 6th degree black belt), boxing, judo, jujutsu and wrestling which would later be known as modern contact karate or kickboxing in Holland.
Chakuriki later became a kickboxing gym as Harinck added Japanese kickboxing and Savate to his repertoire. Harinck founded the NKBB (Dutch Kickboxing Association) in 1976, the MTBN (Dutch Muay Thai Association) in 1983, the WMTA (World Muay Thai Association) and the EMTA (European Muay Thai Association) in 1984.
Harinck is one of the most famous trainers in the sport and has trained numerous world champions including Peter Aerts, Branko Cikatić, Jérôme Le Banner, Badr Hari and Hesdy Gerges.
He announced his retirement in April 2013 at the age of sixty-nine. In January 2016 Thom Harinck began coaching again. He trains a group of fighters daily, that includes Hesdy Gerges. In May 2016 Harinck published his memoirs in the English language. The book is called “Thom Harinck: Godfather of Muay Thai in The West” and is co-written with Julio Punch. An updated edition was released by Amsterdam Publishers in June 2020.