Hey, how does a guy celebrate his 19th birthday?

By blowing out candles?

Or by blowing chunks?

Hunter Smith will soon find out.

On his big day, Smith — and 28 other prospects — will huff and puff through fitness testing Thursday morning at WinSport, Day 1 of Calgary Flames’ rookie powwow.

For the Windsor, Ont., native, it will mark his third stomach-churning stab at the conditioning challenge — after sweating through the torture at the National Hockey League’s pre-draft combine, then at the Flames’ development camp in July.

And now once more for good measure, capping a unique off-season.

“This is a pretty different summer for me — pretty chopped up,” says Smith. “But I thought I did a pretty good job with my training, just making everything work. I wouldn’t say it was a summer unlike any other . . . but it was definitely busy. I was very happy with the way it went.”

Given the timing of his birthday, he has always been at tryouts, at training camps, on Sept. 11 — more focused on displaying his gifts than receiving them. Participating in his first-ever pro camp is a scrapbook-worthy occasion, but Smith has had other memorable moments, too.

One, in fact, stands out — the day he turned 15 years old.

“Probably my best one,” says Smith, chuckling. “(With the Windsor Junior Spitfires), we were in a tournament in Ottawa. First day of the tournament, in the first game, we played the Ottawa Junior Senators and I had two goals. Then we had a game in the afternoon and I had five goals. Seven goals on my birthday — that was kind of good.”

That offensive touch, to go with a six-foot-seven frame, made Smith an ideal addition to the Flames cupboards on the draft weekend in Philadelphia.

With the 54th overall selection — which was the pick they received from the Colorado Avalanche in return for Reto Berra (who had been part of the Jay Bouwmeester exchange with the St. Louis Blues) — the Flames nabbed the right-winger.

Not surprisingly, at that size, he’s a work in progress.

But he wants to ensure that foot speed isn’t a drawback.

“At the development camp, a lot of the coaches, who maybe hadn’t seen me play, maybe thought I was going to be a bit slower for a big guy,” says Smith. “But I think I’m impressed them. Now, hopefully, they notice bigger strides in my skating at this camp, at the rookie tournament.”

Smith spent the past couple of weeks at the main camp of his junior club, the Oshawa Generals of the Ontario Hockey League. His plan? Getting ready to make a good impression on Flames brass.

“I’ve been just focusing on staying in shape, keeping my pace up, my legs under me, before I get to Calgary,” he says. “That was the main thing.”

In 2012-13, he tallied one point — an assist — in 30 outings with the Generals. Last winter? How about 40 points — and 100 penalty minutes — in 64 appearances? Then another 11 points in 12 playoff games.

NHL teams take certain note of that kind of progression.