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Remember when Glenn Yong sent the Internet into a minor meltdown after flaunting his abs at Mediacorp's Countdown Party By The Beach earlier this year?

Well, it turns out that he wasn't even his leanest back then. 

We first suspected something was up after watching his latest Instagram Stories from Shanghai.

Glenn was working out with lawyer and former national sprinter Timothee Yap before the pair completed a 10km run around the city. In another Story, Timothee casually captioned it "<8% BF Club".

Naturally, we had to ask: Is Glenn's body fat percentage below 8%? His manager confirmed that indeed he is. 

The thing is, Glenn wasn't actually aiming to be that lean. It simply was a result of preparing for the drama Step Dave last year.

Speaking to 8days.sg, Glenn revealed: “During filming, my body fat was around 5.4 per cent, nowadays, it's around 7–8 per cent.”

“Maybe it started because I was cutting for a role I did last year, where I had to strip down completely,” he tells us.

Once he started, however, the routine quickly became part of his everyday life.

The American College of Sports Medicine says a healthy body fat range for men is between 10 to 22 per cent.

Glenn tells 8days.sg that he spends an hour walking on a treadmill at a 15 per cent incline at a speed of 5.5km/h, burning roughly 800 calories each time.

His diet has also become considerably cleaner, and he “mainly eat[s] protein and less carbs”.

Of course, getting that lean wasn't all a bed of roses.

“In the beginning, I felt weak and dizzy, but eventually my body got used to it,” he says on the toll it took on his body at the start.

When asked if he was ever worried that it would affect his health, Glenn simply replied, "I was just focused on my craft and being in character."

Photos: timotheeyjw/IG