Former IBF super flyweight champion Jerwin Ancajas is ready to move up in weight.

After being at 115-pounds for nearly six years, Ancajas is heading up to the bantamweight limit of 118.

Last Saturday night at the Cosmopolitan in Las Vegas, Ancajas took plenty of punishment in a twelve round unanimous decision loss to Fernando Martinez, who walked away with the IBF's strap.

There was a rematch clause in place, with Ancajas deciding that it's better for his health to move up a few pounds.

The Filipino boxer revealed that he struggled to make the super flyweight limit for last week's defense.

His trainer, Joven Jimenez, said Ancajas woke up at 118 -pounds on the day of the weigh-in - and spent most of the morning shaving off the excess weight until he hit the super flyweight mark.

“Usually, on Friday we’ll just work out a bit before the weigh-in,” said Jimenez to Rappler. “Not this time, he wasn’t really able to recover and rehydrate.”

Ancajas admits that his body began to decline as the fight played out. The boxer's legs seemed to be gone by the second half of the fight - which led to Martinez doing a lot of damage with hard combinations connecting often.

“My body betrayed me,” said Ancajas to the paper. “I could see his punches. I knew they were coming, but I couldn’t react. Even my brain wouldn’t respond, no muscle memory. So I would just absorb them [punches].”

Ancajas said just like the way he made weight, he relied on pure will and heart to last the distance.

“At least, I gave it all," Ancajas said. "I’ve fought as a bantamweight before, but it’s been a long time. I would need a tune-up fight to find out how my body will respond.”