[1] Kaensak's father continued to force him to fight around 50 times out of the Taputhai gym until he was considered a rising star.
At 15-years-old, Kaensak would begin training under the famous Gimyu Lerkchai, the trainer of the various Sor.Ploenjit fighters as well as Lakhin Wassandasit.
[2] Kaensak would fight dozens of times in various venues until he won the littleweight championship (80 lbs/36.3 kg) at the Karunniwet Stadium in Chonburi province.
He excelled at punching and kicking and was adamant about having an immediate response to every one of his opponent's techniques, thus creating his trademark counter-kicking style.
[7] In 1989 Kaensak would enter the peak of his career by earning Lumpinee and Rajadamnern stadium titles simultaneously within the same weight class, becoming one of the handful of fighters who were able to do so.
In 1991, Kaensak would receive a purse of ฿380,000 (equivalent to ฿799,355 in 2020), making him the highest paid athlete of the golden era of Muay Thai.
[8][11] To determine who was to win the 1992 Fighter of the Year award, Jaroensap Kiatbanchong was matched up as the underdog against Kaensak in December 1992 with the Lumpinee junior bantamweight championship (118 lbs/53.5 kg) at stake.
Kaensak was praised for his excellent defensive performance against Lamnamoon's clinches and knees and was also able to defeat the highly skilled Chatchai while he was still in his prime.
[1][7] After losing to Baiphet Loogjaomaesaiwaree, one of Superbon Banchamek's predecessors, Kaensak decided to retire from Muay Thai competition within Thailand in 1997.
Just 6 days after his final Muay Thai fight within Bangkok, Kaensak had his first professional boxing match and won by KO.
He came out of retirement multiple times by fighting at a higher weight class against foreign champions Fabio Pinca and Tetsuya Yamato.
[15][16] Kaensak cited Poot Lorlek, Vicharnnoi Porntawee, Dieselnoi Chor.Thanasukarn, Samart Payakaroon, and Chamuekpet Hapalang as his top 5 greatest Muay Thai fighters.