Old Man Winter has finally taken New Yorkers to task. With temperatures dropping and snow on the horizon, escaping winter’s harrowing chill is on top of everyone’s to-do list. But while boozy nights spent fireside might be how you’d prefer to fight frigidity, chances are it isn’t exactly in line with your New Year’s resolution. Defrost with these five healthy ways… and you may even burn a few calories.

SWEAT

Bikram yoga (often called “hot” yoga) has been on everyone’s lips since countless celebrities attributed their svelte bodies to this practice of 26 postures performed in a 105 degree room. For 90 minutes, you’ll be more focused on how flexible you are than the sweltering temperature. Harness your chi smack dab in the middle of Midtown at Bikram Yoga Grand Central, where a single class includes a towel and mat rental ($25) and weekday classes are scheduled about every two hours, 226 East 54th Street, 7th Floor, 212-799-3085.

If you’re just not one of those “yoga people,” try hot Pilates. This 60-minute class shares the flab-busting benefits of a regular Pilates class, but the room is kept anywhere from 95 to 100 degrees for a deeper stretch and an escalated heart rate. The high temperature increases blood flow and burns calories while ridding the body of toxins via sweat. The Yoga Room in Astoria, Queens’ “Hot Bodies” hot Pilates class ($20) will strengthen your body from your core out, using rings, blocks and bands to tone and tighten. Prior Pilates experience is recommended, 38-01 35th Avenue, Astoria, 718-274-0255.

STEAM

Since 1892 the Russian and Turkish Baths in the East Village have been New York City’s go-to for steamy relaxation. The authentic Russian banya (or bath) is made from 20,000 pounds of rock and cooked overnight to a stifling temperature. During the day, these rocks exude an intense heat which immerses visitors in a steamy, “radiant” heat. Once it becomes unbearable, douse yourself with a bucket of ice cold water (dozens line the room). This torturous melding of hot and cold has been practiced by Russians for decades… and there’s good reason why: sweating releases excess water and salt from the body, opening pores and softening skin, so not only does this provide relief from the heat, it also cleanses your skin of salts on the surface. Admission is $35 and includes robe, slippers, towel, soap and a razor, 268 East 10th Street, 212-674-9250.

SOAK

Spa Castle, the 100,000-square-foot spa in Flushing, Queens that spans five stories, combines Asian saunas and European spas to offer a myriad of pools, baths, steam rooms and treatments, all designed to de-stress. $35 grants you admission Monday through Friday ($45 on weekends), which includes use of all spa facilities (with no time limit), towels and “uniform” (a t-shirt and cotton pants). The indoor spa on the lobby floor is home to four different heated mineral pools, complete with massaging aqua-jets. The Hinoki bath, modeled after ancient Japanese baths and built with pine over 300 years old, brings together heat and scent to calm. Hot mineral water flows while a balsam aroma floats through the air. Breathe deep and try not to fall asleep, 131-10 11th Avenue, College Point, 718-939-6300.

You may recognize Supple Spa from its cameo on MTV’s ill-fated dating show, “Gamekillers.” Supple Spa specializes in treatments for two, even if you’re not technically a couple. Drag your best friend or sister and strip down for the The 90-minute Royal Bath ($150, $300 for couples) treatment. It begins with a 50-minute Swedish or deep tissue massage. Then, dry skin and dead cells are sloughed off with a Dead Sea salt body scrub. Finally, you’ll slip into a hot bath infused with oils and rose petals as a massage therapist tackles the pressures in your neck, shoulders and scalp. So indulgent even Kate Middleton might consider betraying the crown. 55 West 19th Street, #2, 212-929-5948.