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All fired up for the Boston Marathon

Boston firefighter Thomas McGrory preferred his winter running indoors — until his girlfriend signed them up for the Boston Marathon. So he adjusted his mindset, and his gear, for cold-weather workouts.

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Thomas McGrory can take the heat. After all, he’s a member of Ladder 15, the Boston Fire Department house right near where runners turn left onto Boylston Street for the final 600 meters of the Boston Marathon.

But the cold? Well, let’s just say he always preferred his workouts indoors. “When it was nice out, I might go run a few miles after working out at the gym,” he says. “I was definitely not someone who runs through the Boston winter. I had no reason to put myself through that before.”

But then last fall McGrory, 30, began training for his first marathon, in Boston on Patriots’ Day. As anyone who’s run the April race knows, training for it means having drawers full of the right running gear and being prepared, mentally and physically, for a smorgasbord of weather—10 degrees and snowing one day, 30 and sunny the next, and come race day, it could be anything from 40 degrees to 70.

For a fair-weather runner who had never done more than seven miles, McGrory adapted quickly: “It’s been amazing to me to go from running three miles and being so happy it’s over to running three miles and feeling like I’m just getting going.”

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Not too hot. Not too cool.

McGrory’s firefighting suit weighs about 30 pounds. “It’s like walking around wearing a big heavy jacket with bricks in it,” he says. “The pants are kind of like snow pants; you feel like you’re sloshing around in them.”

While that makes sense for fighting fires, McGrory discovered that bigger and bulkier isn’t better for marathoners—even in the dead of winter.

“I learned very quickly that my cotton shirt and cotton sweatshirt don’t feel good on runs in the cold,” he says. “First I’d be too hot, then I’d get so cold once they were soaking wet from sweat.”

He revamped his running wardrobe, opting for apparel made of fabrics like merino wool that have a high warmth-to-weight ratio, quickly move sweat away from the skin, don’t chafe, and provide comfort through a full range of motion. In New England, where merino wool is traditionally associated with fall sweaters and ski layers, it’s also a surprisingly ideal fabric for marathon training, because of its breathability, temperature control, and resistance to odor.

“I’ve got it all figured out now,” McGrory says after marathon training through a winter that featured frequent Nor’easters and single-digit high temperatures.

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Climbing the distance ladder

McGrory was far from a slug this time one year ago. The West Roxbury native ran track at Bishop Memorial School. His specialty was the 400-meter dash—just a little longer than the distance from the 26-mile mark of a marathon to its 26.2 mile finish line. “I always liked running fast for short periods of time and getting it over quickly,” he says. McGrory also ran as required while in the Army for eight years.

After leaving the military, he got his degree from UMass Amherst and then joined the fire department. “It was the next logical step after the Army,” he says. “I love being in the city of Boston and helping people.” For most of the three years he’s been a firefighter, McGrory focused his workout routine on lifting weights and other gym-based exercise.

Then came last August. McGrory’s girlfriend, Alexandra Rosenfeld, said she wanted to run the marathon and asked him, “Would you want to run it with me?” McGrory said yes. “I thought it was one of those in-passing things,” he says. “I didn’t think I’d hear about it after that.” After a few months, however, Rosenfeld said it would soon be time for charity marathoners to sign up for Boston. “Oh, you were serious about that,” McGrory responded.

Although Boston is famous for its qualifying standards for everyday runners, about 20 percent of the 30,000-runner field run to raise money for charity and don’t need a qualifying time. McGrory and Rosenfeld chose to support the Heather Abbott Foundation. Abbott’s left leg was amputated as a result of injuries she sustained in the 2013 Boston Marathon bombing, and she created her foundation to help provide customized prostheses to amputees who have lost limbs to traumatic circumstances.

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Because Rosenfeld has run Boston twice and the New York City Marathon once, she took charge of the couple’s training plan. The key to each week is a long run on Sunday, topping out at 18 miles four weeks before the marathon. “Those distances looked really scary at first,” McGrory says. “Now that I’m doing it, I like it a lot. It’s really rewarding.”

There’s one other difference between McGrory the firefighter and McGrory the marathoner. His work schedule calls for two 24-hour shifts every seven days. McGrory says he doesn’t really feel fatigue in a situation like responding to a fire after 20 hours on the job. “When something serious happens at work, you’re laser-focused, and there’s so much adrenaline going,” he says. “You don’t notice how tired you are until later.”

In contrast, there was his 18-mile long run, which occurred on a Sunday morning immediately after being on duty for 25 hours. “Slogging it out in the snow and cold dodging traffic, I’ll be honest, there’s no adrenaline there,” he says. “There was just exhaustion. Mentally, I was like, ‘Don’t think about how far there is to go. Just go on autopilot and get it done.’”

McGrory and Rosenfeld will run together on April 16 and expect to finish in about 4.5 hours. They also expect a different experience than that 18-miler. “Everybody says it goes by so fast; that before you know it, there’s the finish line,” McGrory says. “I know how important the marathon is to the city, especially this year, five years after the bombing. I want to take the time to soak it in, see all the people cheering, and just really enjoy the day.”

This content was produced by Boston Globe Media's BG BrandLab in collaboration with the advertiser. The news and editorial departments of The Boston Globe had no role in its production or display.