It is not as simple as opening the door and hitting the track in winter. There are a few things you can do to ensure you are getting the most out of your run, and, importantly, not doing more harm than good.

Warm up, cool down

【小题1】 Your muscles need some time to warm up when it's cold, so take it easy when you set off and do a few stretches （伸展）once you're finished.

Drink water

You might not feel hot, but that's because sweat evaporates （蒸发）more quickly into the chilly, dry air. So be sure to drink water before, during and after cold-weather workouts. 【小题2】 A belt bottle conveniently attaches to your waist so you don't have to carry it and can have a drink whenever you feel like it・

【小题3】

Running in cotton is a bad idea. Wear thin, breathable layers of synthetic （合成 的)）clothing that help protect you from the wind and snow, but still let out heat and moisture （水分）.Thirty percent of your body heat escapes through your hands and forty percent through your head. Wear a hat, or beanie （无边小便帽）, and gloves so your circulatory system can distribute warm blood to the rest of your body. 【小题4】

Run into the wind

【小题5】 . Obviously, it will be an easier passage home with some extra help from Mother Nature. But, more importantly, you won't have the wind in your face for the second half of your run, when you are more likely to be sweating and catch a chill.

For many Americans, regular exercise is a complicated commitment—one made at the beginning of January that fades out within weeks or months. Busy work schedules, a lack of motivation and unease towards exercising in public all contribute to the discouraging statistics that only around a quarter of adults exercise enough per week.

This month, enterptiser Trent Ward and designer Yves Behar are uncovering their design for a mirror fitness system, Forme. Forme is reflective like a mirror, uses machine learning to heighten workouts, and offers attachments including ankle belts, rope handles and a heart rate monitor. When not in use, the two arms that form the resistance pulley (滑轮) system fold behind it and the display screen disappears, turning Forme into a simple full—length mirror.

Interest in home exercise has particularly increased recently around the world. Home workout apps have seen a significant uptick in downloads, and trendy brands like Peloton have rolled out free virtual workouts for everyone stuck indoors. One French athlete who was kept away from others chose to run an entire marathon on his 23-foot balcony.

But beyond the new restrictions affecting daily workout routines, Ward and Behar are tapping into the same concerns that have made every home workout appealing：the ability to save time and sweat in the privacy of one’s home. In an age of personal metrics (衡量标准)--where one can measure their heart rate and sleep cycles with smart watches and train for marathons with AI smart sneakers----Ward and Behar want to improve exercise through machine learning. Forme evaluates performance and adjusts weights accordingly. Easy access to one’s own performance data also makes it easier to track that progress and stay motivated.

Though it’s too soon to tell if mirror gyms will be the trend of the late 2010s to 2020s, Behar explained that having a screen in the home can become the basis for more than just fitness, such as shopping or telemedicine.

A study, published in European Heart Journal, is the first to assess how different movement patterns throughout the 24-hour day are linked to heart health.

In this study, British researchers analyzed data from six studies, involving 15,246 people from five countries, to see how movement behavior across the day is associated with heart health. Each participant used a wearable device, a key novelty, on their thighs (大腿) to measure their activities throughout the 24-hour day and had their heart health measured.

The researchers identified a series of behaviors that make up a typical 24-hour day, with time spent doing moderate-vigorous activity providing the most benefit to heart health, followed by light activity, standing and sleeping compared with the negative impact of sedentary (久坐) behavior. The team modeled what would happen if an individual changed various amounts of one behavior for another each day for a week, in order to estimate the effect on heart health for each scenario. When replacing sedentary behavior, as little as five minutes of moderate-vigorous activity had a noticeable effect on heart health.

Dr. Jo Blodgett, first author of the study, said, “The big takeaway from our research is that while small changes to how you move can have a positive effect on heart health, intensity of movement matters. The most beneficial change we observed was to replace sitting with moderate-vigorous activity, which could be a run, a brisk walk, or stair climbing, basically any activity that raises your heart rate and makes you breathe faster, even for a minute or two. ”

Dr. Jo Blodgett also pointed out that although time spent doing vigorous activity was the quickest way to improve heart health, there are ways to benefit for people of all abilities — it’s just that the lower the intensity of the activity, the longer the time is required to start having a reliable benefit. Using a standing desk for a few hours a day instead of a sitting desk, for example, is not only a change over a relatively large amount of time but is also one that could be combined into a working routine fairly easily as it does not require any time commitment.