In the winter most people don’t want to go outside, especially to exercise. But when it gets cold and dark it’s even more important to get your body moving. The reason is simple: your psychology follows your physiology. And it turns out that exercise and overall fitness not only improves your health, but can change your mood.
Lots of people get depressed in the winter whereas they might ordinarily be happy throughout the rest of the year. They don’t like to be stuck in the house and it makes them anxious or depressed. So they slump their shoulders down, point their eyes to the ground, and tend to not move a lot. What’s really happening is that we are using our body to protect ourselves from the cold, but our physiology can put our psychology into a state of depression.