"How is that guy standing?" - Fans grimace at the sheer force of Superlek's knee strikes in training camp ahead of ONE 168

Reigning ONE flyweight kickboxing world champion Superlek Kiatmoo9 has an almost otherworldly ability to generate one-shot knockout power in his legs. Many fans have wondered his secret to doing so and 'The Kicking Machine' showcased how he developed it.

In a video posted by ONE Championship on Instagram, Superlek was doing drills focused on throwing knees to the body while in a Muay Thai clinch.

Fans were amazed at Superlek's intensity in training camp and his training partner's ability to withstand it all, sharing their sentiments in the comments section which can be read below:

"What is bro laughing at 😭😭"

"What the hell man. How is that guy standing"

"Me and bro when we say " let's do a soft training ""

"This powerful moan is Muay Thai's top secret sports science. 😂"

The Thai hero will look to add another accolade to his legendary resume at ONE 168: Denver on September 6 as he challenges two-sport ONE world champion Jonathan Haggerty for his bantamweight Muay Thai crown.

Jonathan Haggerty eager for shot at revenge against Superlek

Nearly six years ago, Superlek and Jonathan Haggerty first faced one another where the former won via TKO due to a doctor's stoppage - a loss that continues to haunt the United Kingdom star.

'The General', who also holds the ONE bantamweight kickboxing world championship, is determined to exact his revenge inside the Ball Arena.

In an interview with Sky Sports MMA Club, Haggerty stated:

"I fought him before, around seven to eight years ago, and he managed to stop me in the second round due to a cut. But, now it's the time to get revenge, and I'm excited for it."

Tickets for ONE 168 are available via Ticketmaster.