While here in Southern California -- where I write this from -- doesn't get ridiculously cold here, sadly in many other places in the country, the low temperatures and weather conditions of Old Man Winter can make it harder than usual for one to get their usual workout, especially if you engage in outdoor activities like jogging, cycling and so on.
According to an article entitled, "Winterize your workout" from The Reno Gazette, they talk about how local gyms are trying to help local fitness buffs and athletes who are used to getting their exercise outside. However, if people do choose to go outside in temperatures below freezing, there are many steps you can take to exercise even when it goes down to about twenty degrees.
Thankfully, when one is working out, the body heats up, allowing us to withstand colder temperatures than we might normally be able to tolerate, even down to twenty degrees. Even when you dress warmly, for example, you should wear multiple layers because your clothes can freeze with sweat. Wear higher-tech materials and not just cotton, make sure to dress with some reflective material for shorter days. Make sure you stretch in a warm room and drink plenty of water afterwards.
These are just some tips one can take to exercise even in some of the bleakest of winter conditions. With these tips, you're sure to get a good workout even in the coldest of Winter weather.