When you size up Tom Hruby’s chances of securing a spot on the Northwestern football team, it would be fair to say the odds are stacked against him.

He’s a junior trying to walk on as a defensive end — meaning he is competing against scholarship athletes aggressively pursued by the university. He’s 32, has a wife, three kids and a full-time job.

Overwhelming odds?

That’s the perfect scenario for Hruby because that’s how he makes his living.

Hruby is an active Navy SEAL.

“I don’t feel like where I’m at today is some outstanding or amazing thing,” Hruby told the Sun-Times. “It’s just more of a challenging route . . . the way I kind of think about finding and accepting and trying to take on these challenges that most people would probably say are impossible, one, or very unlikely or just plain dumb.”

Dumb? No way. Impossible? Not if you know Hruby. Very unlikely? That’s the case for any walk-on trying to make a Big Ten football team.

Keep in mind Northwestern’s Pat Fitzgerald was 32 during his first season as head coach in 2006 — that’s after a full playing career at NU, a stint with the Dallas Cowboys as a linebacker and stops as an assistant with Maryland, Colorado, Idaho and Northwestern.

Fitzgerald marvels at Hruby’s drive.

“I know I couldn’t do it,” Fitzgerald said. “He’s a man’s man.

“He was relentless, absolutely relentless, like you would suspect from a SEAL.”

Hruby is trying to balance the rigors of playing Big Ten football, staying on top of his demanding studies at NU and fulfilling his obligation as an active Navy SEAL. His typical day this summer started with strength training in Evanston at 6 a.m. and runs until his last class finished at 8:30 p.m.