It is a test of mettle to play behind an ironman.

Ruben Guzman is the substitute punter for a Hawaii football player with perfect attendance.

Despite deep bruises and aches to several points of his body, Scott Harding has not missed a punting opportunity for the Warriors this season. Harding is averaging 42.0 yards on 57 punts. Most significant, only 11 of his punts have been returned. He leads the FBS with 23 punts downed inside the 20.

"I’m always ready at all times," said Guzman, a senior who has not attempted a punt in a game since Nov. 9, 2013.

Harding, who also plays slotback and punt returner, appeared to aggravate a hip ailment when he was tackled after making a catch in the second quarter against Nevada the past Saturday. Harding returned in the second half, launching two punts, including a 60-yarder.

"Scott pulled through," said Guzman, who was prepared if summoned.

Guzman said he is supportive of special teams coordinator Chris "Demo" Demarest’s decisions.

"Whatever’s best for the team, I’m for it," Guzman said. "Do I want it? I do. The team comes first. … So far, we’re doing pretty good on punts. If it’s working, it’s working."

Guzman joined the Warriors in July 2013 after two years at Riverside (Calif.) City College. He punts left-footed.

During games, Guzman keeps his legs warm and often stretches. He also works on his drops. He tells himself: "You’re just taking two steps and kicking the ball as hard and as high as you can."

He punts into the kicking net on the sideline, stopping after "four good punts."

And then he waits for a call.

"Until Demo gives me the green light, I’m already warmed up and ready," Guzman said.

Without a football scholarship, he would have gone to college in California.

"I probably wouldn’t have played football," Guzman said. "I’m very grateful for this opportunity coach (Norm) Chow gave me. I believe I’m the first person in my family to play college football. It’s a big deal."